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802.11 Wireless Networks: The Definitive Guide
by Matthew GastAs we all know by now, wireless networks offer many advantages over fixed (or wired) networks. Foremost on that list is mobility, since going wireless frees you from the tether of an Ethernet cable at a desk. But that's just the tip of the cable-free iceberg. Wireless networks are also more flexible, faster and easier for you to use, and more affordable to deploy and maintain. The de facto standard for wireless networking is the 802.11 protocol, which includes Wi-Fi (the wireless standard known as 802.11b) and its faster cousin, 802.11g. With easy-to-install 802.11 network hardware available everywhere you turn, the choice seems simple, and many people dive into wireless computing with less thought and planning than they'd give to a wired network. But it's wise to be familiar with both the capabilities and risks associated with the 802.11 protocols. And 802.11 Wireless Networks: The Definitive Guide , 2nd Edition is the perfect place to start. This updated edition covers everything you'll ever need to know about wireless technology. Designed with the system administrator or serious home user in mind, it's a no-nonsense guide for setting up 802.11 on Windows and Linux. Among the wide range of topics covered are discussions on: deployment considerations network monitoring and performance tuning wireless security issues how to use and select access points network monitoring essentials wireless card configuration security issues unique to wireless networks With wireless technology, the advantages to its users are indeed plentiful. Companies no longer have to deal with the hassle and expense of wiring buildings, and households with several computers can avoid fights over who's online. And now, with 802.11 Wireless Networks: The Definitive Guide , 2nd Edition, you can integrate wireless technology into your current infrastructure with the utmost confidence.
802.11 Wireless Networks: The Definitive Guide
by Matthew S. GastAs we all know by now, wireless networks offer many advantages over fixed (or wired) networks. Foremost on that list is mobility, since going wireless frees you from the tether of an Ethernet cable at a desk. But that's just the tip of the cable-free iceberg. Wireless networks are also more flexible, faster and easier for you to use, and more affordable to deploy and maintain.The de facto standard for wireless networking is the 802.11 protocol, which includes Wi-Fi (the wireless standard known as 802.11b) and its faster cousin, 802.11g. With easy-to-install 802.11 network hardware available everywhere you turn, the choice seems simple, and many people dive into wireless computing with less thought and planning than they'd give to a wired network. But it's wise to be familiar with both the capabilities and risks associated with the 802.11 protocols. And 802.11 Wireless Networks: The Definitive Guide, 2nd Edition is the perfect place to start.This updated edition covers everything you'll ever need to know about wireless technology. Designed with the system administrator or serious home user in mind, it's a no-nonsense guide for setting up 802.11 on Windows and Linux. Among the wide range of topics covered are discussions on:deployment considerationsnetwork monitoring and performance tuningwireless security issueshow to use and select access pointsnetwork monitoring essentialswireless card configurationsecurity issues unique to wireless networksWith wireless technology, the advantages to its users are indeed plentiful. Companies no longer have to deal with the hassle and expense of wiring buildings, and households with several computers can avoid fights over who's online. And now, with 802.11 Wireless Networks: The Definitive Guide, 2nd Edition, you can integrate wireless technology into your current infrastructure with the utmost confidence.
802.11 Wireless Networks
by Alan Holt Chi-Yu HuangWireless communication has the advantage of mobility and obviates the need for cabling, but is inherently less secure and is subject to the heavy regulation of the radio frequency spectrum. Nevertheless, the allocation of unlicensed parts of the spectrum has facilitated the growth in wireless local area networks (WLANs). WLAN technology is progressing at a rapid pace, but the most widely accepted WLAN standard is the IEEE 802.11. This unique and highly practical text introduces the principles of WLANs based upon the IEEE 802.11 standards, demonstrating how to configure equipment in order to implement various network solutions. Readers will gain understanding of the security implications of wireless networks and learn how vulnerabilities can be mitigated. Additionally, the book examines the underlying 802.11 protocols and explains how to build mathematical models in order to analyze performance in a WLAN environment. Topics and Features: presents a practical approach supported by the extensive use of examples and detailed instructions; discusses various wireless network solutions across a number of different vendor platforms, including Cisco Aironet, Alactel-Lucent Omniaccess and Meru Networks; provides numerous mathematical models for analyzing the performance of IEEE 802.11 standards, and shows how to build these models using Maple; examines issues of wireless security and describes how to implement a wireless network with enterprise security; investigates the medium access control sub-layer, and models for performance analysis of the MAC layer; reviews the physical sub-layers of 802.11, describing modulation techniques and examining how devices adapt to changes in the RF environment. A highly useful text/reference for industry professionals, undergraduate and graduate-level students will also find this book an ideal companion to a university course on wireless networking. Dr. Alan Holt is Chief Technical Officer at the network consultancy company IP Performance Ltd., based in Bristol, UK. He is author of the popular Springer text Network Performance Analysis: Using the J Programming Language. Dr. Chi-Yu Huang works for Tata Technologies Ltd., and is currently a software consultant on the Airbus project in Bristol. She was formerly Operations Manager for DL Consulting, New Zealand.
802.11ac: Wi-Fi at Gigabit and Beyond
by Matthew S. GastThe next frontier for wireless LANs is 802.11ac, a standard that increases throughput beyond one gigabit per second. This concise guide provides in-depth information to help you plan for 802.11ac, with technical details on design, network operations, deployment, and monitoring.Author Matthew Gast—an industry expert who led the development of 802.11-2012 and security task groups at the Wi-Fi Alliance—explains how 802.11ac will not only increase the speed of your network, but its capacity as well. Whether you need to serve more clients with your current level of throughput, or serve your existing client load with higher throughput, 802.11ac is the solution. This book gets you started.Understand how the 802.11ac protocol works to improve the speed and capacity of a wireless LANExplore how beamforming increases speed capacity by improving link margin, and lays the foundation for multi-user MIMOLearn how multi-user MIMO increases capacity by enabling an AP to send data to multiple clients simultaneouslyPlan when and how to upgrade your network to 802.11ac by evaluating client devices, applications, and network connections
802.11n: Wi-Fi Above 100 Mbps
by Matthew S. GastWireless has finally come of age. With a significant jump in throughput over previous standards, 802.11n is the first wireless technology that doesn’t trade speed for mobility, and users have stormed onto wireless networks with a passion. In this concise guide, Matthew Gast—chair of the IEEE group that produced revision 802.11-2012—shows you why wireless has become the default method of connecting to a network, and provides technical details you need to plan, design, and deploy 802.11n today.Building a network for the multitude of new devices is now a strategic decision for network engineers everywhere. This book gives you an in-depth look at key parts of 802.11n, and shows you how to achieve an Ethernet-free wireless office.Learn how MIMO’s multiple data streams greatly increase wireless speedDiscover how 802.11n modifications improve MAC efficiencyExamine advanced PHY features such as beanforming and space-time code blockUse advanced MAC features to maintain interoperability with older devicesPlan an 802.11n network by determining traffic demand, key applications, power requirements, and securityChoose the architecture, select hardware, and plan coverage to design and build your network
8051 Microcontrollers: Fundamental Concepts, Hardware, Software And Applications In Electronics
by Salvador Pinillos GimenezExplains internals of 8051 hardware and relates to general principles of computer architecture;<P><P> Demonstrates how to implement various electronics applications, with hardware and software design for 8051 microcontrollers;<P> Includes numerous, solved examples, end-of-chapter exercises, laboratory and practical projects.<P>This textbook describes in detail the fundamental information about the 8051 microcontroller and it carefully teaches readers how to use the microcontroller to make both electronics hardware and software. In addition to discussion of the 8051 internals, this text includes numerous, solved examples, end-of-chapter exercises, laboratory and practical projects.
806: A Novel
by Cynthia WeilSibling 1 throws blenders and plays guitar. Sibling 2 is allergic to everything and is into magic. Sibling 3 is a varsity swimmer with a group of female fans. Enough said. The only thing they have in common is their biological father, and the only thing they can agree on is that they all want to meet him. With the help of a broken-down, “borrowed” Jeep, KT, Jesse, and Gabe make their way across the country evading police, trying their luck on the slots, and meeting a life-changing pig, all to track down Donor 806, their father. Any hope of success requires smarts, luck, and ingenuity. Good thing they have each other...even if they don't see it that way.
808 Conversation Starters for Couples: Spark Curious Chats During Dinner Time, Date Night or Any Moment
by Robin Westen“Will have you quizzing each other on topics like morality, politics and your hopes for the future . . . you’ll get to know each other even better.” —StylistHere is your ultimate list of casual conversation prompts to spark fun and interesting dialogue, deepen communication, and increase intimacy. Flip open to any page and start an interesting new talk with your partner. You never know what passions, hopes or even funny stories might be revealed.What would be the title of your autobiography?Would you say you were born in the wrong decade?What TV show is your guilty pleasure?What are three jobs you definitely couldn’t do?What’s the most important piece of advice you ever received?What’s the very first memory you can recall?
80s Chart-Toppers: Every Chart-Topper Tells a Story
by Sharon DavisThe '80s were a decade of musical change. As the '70s disco stranglehold was broken, rock, gay, dance and pop music competed with funk and soul, romantic ballads and political protest, computerised music and controversy. The glamour of costume, greasepaint and cross-dressing was put to good use by New Romantic groups like Spandau Ballet, Duran Duran, Soft Cell, Culture Club and the Human League, while the world also looked to Britain for the most exciting pop acts such as the multi-million-selling Wham!, Frankie Goes To Hollywood, Eurythmics and the Pet Shop Boys. Mainstream dance music was at its peak, spearheaded by Stock, Aitken and Waterman, and their stable of artists, including Kylie Minogue, Jason Donovan and Rick Astley, were all chart-topping names. From the USA came the artist of the decade, Michael Jackson, while Madonna and Whitney Houston provided the 'Girl Power' of the '80s. The decade also saw the philanthropic side of the music industry as the stars responded to famine in Ethiopia with the charity records 'Do They Know It's Christmas?' and 'We Are The World'. The'80s catered for all musical tastes, no matter how bizarre, and was far more eclectic than any other decade. From bubble-gum pop with Bucks Fizz to the stadium rock of Simple Minds,'80s Chart-Toppers brings a comprehensive year-by-year, month-by-month guide to the hottest sounds of the decade.
80th Conference on Glass Problems (Ceramic Transactions Series #268)
by ACerSThe 80th Glass Problem Conference (GPC) was organized by the Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802 and The Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. The Program Director was S. K. Sundaram, Inamori Professor of Materials Science and Engineering, Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802. The Conference Director was Robert Weisenburger Lipetz, Executive Director, Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. The GPC Advisory Board (AB) included the Program Director, the Conference Director, and several industry representatives. The Board assembled the technical program. Donna Banks of the GMIC coordinated the events and provided support. The Conference started with a half-day plenary session followed by technical sessions. The themes and chairs of four technical sessions were as follows: Melting and CombustionUyi Iyoha, Praxair, Inc., Peachtree City, GA, Jan Schep, Owens-Illinois, Inc., Perrysburg, OH, and Justin Wang, Guardian Industries, Auburn Hills, MI Batch, Environmental, and ModelingPhil Tucker, Johns Manville, Littleton, CO and Chris Tournour, Corning Inc., Corning, NY RefractoriesLarry McCloskey, Anchor Acquisition, LLC, Lancaster, OH and Eric Dirlam, Ardagh Group, Muncie, IN Sensors and ControlAdam Polycn, Vitro Architectural Glass, Cheswick, PA and Glenn Neff, Glass Service USA, Inc., Stuart, FL
81: Tikron the Jungle Master
by Adam BladeA great Monkey-Beast stands in Tom's way as he searches the Dark Jungle for the next potion ingredient. Will Tom prevail against the might of the Jungle Master? Don't miss the other titles in Series 14 - The Cursed Dragon:- Raffkor the Stampeding Brute- Vislak the Slithering Serpent- Falra the Snow Phoenix
81 Days Below Zero: The Incredible Survival Story of a World War II Pilot in Alaska's Frozen Wilderness
by Brian MurphyShortly before Christmas in 1943, five Army aviators left Alaska’s Ladd Field on a test flight. Only one ever returned: Leon Crane, a city kid from Philadelphia with little more than a parachute on his back when he bailed from his B-24 Liberator before it crashed into the Arctic. Alone in subzero temperatures, Crane managed to stay alive in the dead of the Yukon winter for nearly twelve weeks and, amazingly, walked out of the ordeal intact. 81 Days Below Zero recounts, for the first time, the full story of Crane’s remarkable saga. In a drama of staggering resolve with moments of phenomenal luck, Crane learned to survive in the Yukon’s unforgiving landscape. His is a tale of the human capacity to endure extreme conditions and intense lonelinessand emerge stronger than before.
81 Financial and Tax Tips for the Canadian Real Estate Investor
by Campbell Don R.From Canada's best-selling real esate author, Don R. Campbell, and his team. From rental properties to business offices, more and more Canadians buying real estate are unwittingly setting themselves up for problems. Real estate investments and their corresponding tax policies are complicated--without knowing the tax rules, investors will see how quickly seemingly viable investments can become financial disasters. 81 Financial and Tax Tips for the Canadian Real Estate Investor offers practical advice on successfully navigating the tax implications of property ownership, including tips on a) deductions from income; b) preparing for an audit; and c) leveraging professional help. Filled with insights and Canadian-specific tips, there's no other book like it on the market.
813: Large Print (The Arsène Lupin Adventures #4)
by Maurice LeblancThe series that inspired the Netflix show: Framed for murder, Lupin must clear his name or face the gallows. Millionaire diamond collector Rudolf Kesselbach is in a Paris hotel room, contemplating the stroke of genius that is about to make him one of the wealthiest men in Europe, when a shadow steals into the room—a shadow with fine clothes, an easy smile, and a revolver pointed at Kesselbach&’s chest. The intruder&’s name, he says, is Arsène Lupin. A few hours later, Kesselbach is found dead on the floor, Lupin&’s calling card pinned to his chest. With the police hot on his trail, the master jewel thief must use every ounce of his genius to escape their traps and find the man responsible for the murder. But as Lupin soon discovers, his freedom is not all that is at stake. The fate of Europe hangs in the balance as well. This ebook features a new introduction by Otto Penzler and has been professionally proofread to ensure accuracy and readability on all devices. &“[Arsène Lupin] has taken his place in public estimation with Sherlock Holmes and other universally admired heroes of fictional crime.&” —The New York Times
81st Conference on Glass Problems (Ceramic Transactions Series #269)
by ACerS (American Ceramics Society, The)The 81st Conference on Glass Problems (GPC) was organized by the Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802 and The Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. The Program Director was S. K. Sundaram, Inamori Professor of Materials Science and Engineering, Kazuo Inamori School of Engineering, The New York State College of Ceramics, Alfred University, Alfred, NY 14802. The Conference Director was Bob Lipetz, Executive Director, Glass Manufacturing Industry Council (GMIC), Westerville, OH 43082. The GPC Advisory Board (AB) included the Program Director, the Conference Director, and several industry representatives. The Board assembled the technical program. Donna Banks of the GMIC coordinated the events and provided support. Due to world-wide COVID-19 pandemic, the conference was a virtual event. It started with a full-day plenary session followed by technical sessions.
82: Falra the Snow Phoenix
by Adam BladeTom's deadliest Quest yet reaches a terrifying conclusion as he enters the Pit of Fire to battle Falra! Can our hero defeat the Beast and find the final potion ingredient needed to break Kensa's curse? Don't miss the other titles in Series 14 - The Cursed Dragon:- Raffkor the Stampeding Brute- Vislak the Slithering Serpent- Tikron the Jungle Master
82 Days on Okinawa: One American's Unforgettable Firsthand Account of the Pacific War's Greatest Battle
by Robert L. Wise"A gritty, first-person account. ... One can hear Shaw’s voice as if he were sitting beside you." —Wall Street JournalAn unforgettable soldier’s-eye view of the Pacific War’s bloodiest battle, by the first American officer ashore Okinawa. On Easter Sunday, April 1, 1945, 1.5 million men gathered aboard 1,500 Allied ships off the coast of the Japanese island of Okinawa. The men were there to launch the largest amphibious assault on the Pacific Theater. War planners expected an 80 percent casualty rate.The first American officer ashore was then-Major Art Shaw (1920-2020), a unit commander in the U.S. Army’s 361st Field Artillery Battalion of the 96th Infantry Division, nicknamed the Deadeyes. For the next three months, Shaw and his men served near the front lines of the Pacific’s costliest battle, their artillery proving decisive against a phantom enemy who had entrenched itself in the rugged, craggy island. Over eighty-two days, the Allies fought the Japanese army in a campaign that would claim more than 150,000 human lives. When the final calculations were made, the Deadeyes were estimated to have killed 37,763 of the enemy. The 361st Field Artillery Battalion had played a crucial role in the victory. The campaign would be the last major battle of World War II and a key pivot point leading to the bombings of Hiroshima and Nagasaki, and to the Japanese surrender in August, two months after the siege’s end.Filled with extraordinary details, Shaw’s gripping account gives lasting testimony to the courage and bravery displayed by so many on the hills of Okinawa.
82nd Airborne: Normandy 1944 (Past & Present Series)
by Stephen Smith Simon Forty<p>An account of the heroic D-Day actions of the US Army’s first airborne division in the series that brings World War II battles to life.<p> <p>Since its formation on August 15, 1942, the 82nd Airborne, commanded by Major General Matthew B. Ridgway, trained exhaustively for their new role, which involved parachuting from C-47s and insertion by Waco CG-4A gliders. After participating in the invasion of Sicily and performing night parachute drops onto the Salerno beachhead in September 1943, the bulk of the division left for the United Kingdom and training for D-Day.<p> <p>Reorganized with two new parachute infantry regiments, the 507th and the 508th, joining the 505th, the division dropped onto the Cotentin peninsula between Ste-Mère-Église and Carentan on the night of June 5–6, in a mission codenamed Boston. Their glider-borne component, the 325th GIR, arrived the next day. Widely dispersed on landing, the division overcame its problems and strong German defenses to take the important town of Ste-Mère-Église. Further intense action along the Merderet River ensured that the Utah beachhead wasn’t compromised, and subsequently, the division fought on losing 5,245 troopers killed, wounded, or missing. When withdrawn after 33 days of action, the division could be satisfied it had performed heroically and helped establish the Allied forces’ foothold in France.<p> <p>The Past & Present Series reconstructs historical battles by using photography, juxtaposing modern views with those of the past together with concise explanatory text. It shows how much infrastructure has remained and how much such as outfits, uniforms, and ephemera has changed, providing a coherent link between now and then.<p>
83 Hours Till Dawn
by Barbara Jane Mackle Gene MillerKidnappers came in the night to seize a 20 year old girl BARBARA JANE, took her to an isolated wooded area and sealed her in a coffin like box underground. Then silence.
83 Minutes: The Doctor, the Damage, and the Shocking Death of Michael Jackson
by Matt Richards Mark LangthorneA definitive look at Michael Jackson's final minutes, revealing for the first time the shocking details behind the tragic death of one of the world's biggest pop stars.On June 25th, 2009, the world was rocked by the tragic news that Michael Jackson—the biggest and most influential music icon since Elvis Presley—had died. He was only 50 years old when paramedics pronounced him dead on arrival at a Los Angeles hospital. For weeks after his death, speculation and rumor abounded concerning the drugs in Jackson’s system and the role Conrad Murray, the singer’s personal physician, had played in the his death. In 2011, Murray was tried and convicted of involuntary manslaughter, for which he served two years in prison.Now, for the first time, readers have access to a comprehensive and truly horrifying account of the crucial moments leading up to Jackson’s demise. Drawing on court documents and testimonials, 83 Minutes presents a multi-perspective tracking of every individual involved and the part they played as the tragedy unfolded, examining forensically the mystery of the 83 minutes that elapsed from the moment Dr. Murray suggested he found Jackson not breathing to the moment the singers' lifeless body was wheeled into hospital.Evenhanded and unbiased, Matt Richards and Mark Langthorne’s account is rich with detail, including the specific cocktail of drugs employed in an attempt to keep Jackson alive and the harrowing conditions in which the troubled genius’s life ended. Included as well is the story of the legal struggle for control of Jackson’s assets that followed his death where Richards and Langthorne report that “the combined earnings of Jay Z, Taylor Swift, and Kanye West since Michael Jackson died come nowhere near the revenues Jackson has earned for his estate after his death.”Written with documentary flair, this powerful and compelling book is already emerging as the definitive account of one of the darkest hours in music history.
831 Stories: Three e-book bundle including Big Fan, Hardly Strangers, and Comedic Timing (831 Stories)
by Alexandra Romanoff A.C. Robinson Upasna BarathRead for Pleasure: Three Romance Novellas from 831 Stories Dive into a collection that celebrates romance in all its sexy, exhilarating, and sometimes messy forms. These three captivating novellas from 831 Stories bring smart writing, sophisticated characters, and steamy plots to the forefront. Whether it&’s navigating political intrigue alongside pop stardom, having a life-changing encounter with an electrifying stranger over the course of a single night, or finding connection in the chaos of New York City&’s creative scene, this omnibus edition promises to charm and delight. BIG FAN A political strategist, recovering from her ex-husband&’s high-profile sex scandal that nearly derailed her career, hears from an unexpected figure from her past: her teenage boy band crush. Torn between ambition and the allure of realizing a long-running fantasy, she must decide if she can risk revisiting the spotlight.. &“Big Fan serves up political intrigue with a side of spine-tingling romance.&” — Vogue &“It sparkles with wit—pair it with a good glass of prosecco and prepare to get lost in this smart, sexy novel.&” — Elissa Sussman, bestselling author of Once More with Feeling and Funny You Should Ask HARDLY STRANGERS When Shera&’s night takes an unexpected turn with the mischievous frontman of an Irish punk band, sparks fly and hearts collide in ways she never could have imagined. Over a single unforgettable evening, she must figure out if she can let down her guard without letting go of herself. &“Fresh, hot, and really f*cking fun. A vibrant portrait of what it&’s like to be young and pursuing a relationship in Los Angeles—or anywhere.&” —Katrina Leno, author of Everything All at Once and Summer of Salt &“This is the exact sort of romance novel I've been looking for: one that hinges on two adults who are messy and a little sloppy but evolving and trying to be better—but keyword: adults..&” —Allison P. Davis, features writer for New York magazine COMEDIC TIMING Moving to New York City was supposed to be Naina&’s fresh start, but the city doesn&’t exactly embrace her with open arms, and it&’s not until she meets an aspiring filmmaker and potential collaborator that she starts to feel at home. But is this a professional connection or a romantic one? And does being open to something more with him mean compromising her sexual identity and ambitions? "I&’ve never read a story that so deftly captures the beauty and overwhelm of expansive attraction." —Haley Jakobson, author of Old Enough, a NYT Editors' Choice &“A raw depiction of romance and friendship, featuring all the complexity of navigating sex and love as a bi woman.&” —Kate Goldbeck, author of You, Again
83rd Conference on Glass Problems, Ceramic Transactions Volume 271 (Ceramic Transactions Series #271)
by ACerS (American Ceramics Society, The)83rd Conference on Glass Problems
84: Xerik the Bone Cruncher
by Adam BladeUnlock your exclusive Battle Shield in the Beast Quest game - this book contains a secret code.Tom's Quest to retrieve the missing royal treasures of Tangala leads him into greater danger. Can he defeat the fearsome Xerik, a monstrous Beast lurking in the swamps of Pania?Don't miss the other books in Series 15: Velmal's Revenge- Wardok the Sky Terror- Plexor the Raging Reptile- Quagos the Armoured Beetle
84 Charing Cross Road
by Helene HanffThis is a touching correspondence between Helene Hanff and the employees at a book shop on Charing Cross Road in London. It spans many years. Short but satisfying, this little book will warm your heart.
84 Charing Cross Road (Virago Modern Classics #776)
by Helene HanffINCLUDES AN EXCLUSIVE INTERVIEW WITH THE READERS'Your ad in the Saturday Review of Literature says that you specialize in out-of-print books. The phrase 'antiquarian book-sellers' scares me somewhat, as I equate 'antique' with expensive. I am a poor writer with an antiquarian taste in books and all the things I want are impossible to get over here except in very expensive rare editions, or in Barnes & Noble's grimy, marked-up schoolboy copies.'So begins the delightfully reticent love affair between Miss Helene Hanff of New York and Messrs Marks and Co, sellers of rare and secondhand books, at 84 Charing Cross Road, London. For 20 years, this outspoken New York writer and Frank Doel, a rather more restrained London bookseller carry on an increasingly touching correspondence. No doubt their letters would have continued, but in 1969, a letter informed Helene that Frank Doel had died. In the collection's penultimate entry, Helene Hanff urges a tourist friend, ''If you happen to pass by 84 Charing Cross Road, kiss it for me. I owe it so much.'