Altitude and its Effects

Travel at High Altitude, Medex, ISBN 0-901100-76-5 (free to download from Medex)
Altitude Illness: Prevention & Treatment, The Mountaineers Books, Bezruchka, ISBN 0-89886-685-5 (pocket sized guide)
Medicine for Mountaineering, The Mountaineers Books, Wilkerson et al, ISBN-10: 1594850763, ISBN-13: 978-1594850769

British Mountaineering Council (BMC) website
International Mountaineering and Climbing Federation (UIAA) website
UIAA Island Peak 
article

Everest Region Guides

Trekking in the Everest Region, Trailblazer Publications, ISBN-10: 1873756992, ISBN-13: 978-1873756997
Everest: Trekking Routes in Nepal and Tibet, Cicerone Press, ISBN-10: 1852844183, ISBN-13: 978-1852844189
Nepal: Lonely Planet Publications, ISBN-10: 174104832X, ISBN-13: 978-1741048322
The Rough Guide to Nepal, Rough Guides, ISBN-10: 1848361386, ISBN-13: 978-1848361386
Trekking in the Nepal Himalaya, Lonely Planet Publications, ISBN-10: 1741041880, ISBN-13: 978-1741041880

Manaslu & Annapurna Region Guides

Manaslu - A Trekker's Guide, Cicerone, ISBN-10: 1852843020, ISBN-13: 978-1852843021 
Nepal: Lonely Planet Publications, ISBN-10: 174104832X, ISBN-13: 978-1741048322
The Rough Guide to Nepal, Rough Guides, ISBN-10: 1848361386, ISBN-13: 978-1848361386
Trekking in the Nepal Himalaya, Lonely Planet Publications, ISBN-10: 1741041880, ISBN-13: 978-1741041880

Kanchenjunga Region Guides

Kangchenjunga: A Trekker's Guide, Cicerone, ISBN-10: 1852842806, ISBN-13: 978-1852842802
Trekking in the Nepal Himalaya, Lonely Planet Publications, ISBN-10: 1741041880, ISBN-13: 978-1741041880
Trekking Nepal: A Traveler's Guide, Bezruchka, Mountaineers Books, ISBN-10: 0898866138, ISBN-13: 978-0898866131
Nepal: Lonely Planet Publications, ISBN-10: 174104832X, ISBN-13: 978-1741048322
The Rough Guide to Nepal, Rough Guides, ISBN-10: 1848361386, ISBN-13: 978-1848361386

Maps

Khumbu, Published by National Geographic, ISBN-10: 1566951240, ISBN-13: 978-1566951241
Lukla - Everest Base Camp, Pocket map, Published by Nepa Maps Himalayan Maphouse, ISBN: 99933-23-63-2
Everest Basecamp Adventure Map, Published by National Geographic, ISBN-10: 1566951828, ISBN-13: 978-1566951821
Mt Everest from Tibet and Nepal, Published by Nepa Maps Himalayan Maphouse, ISBN: 99933-23-22-5
Mount Everest, Published by Schweizerische Stiftung für Alpine Forschung, ISBN 3-85515-105-9
Island Peak (Imja Tse), 1:20,000, Gecko Maps, ISBN: 9783906593203
Island Peak (Imja Tse), 1:30,000, Nepa Maps, ISBN 10: 9993323004, ISBN 13: 9799993323005
Jiri - Pikey - Everest, 1:125,000, Nepa Maps, ISBN 13: 9789993347286
Island Peak (Imja Tse), 1:20,000, Gecko Maps, ISBN: 9783906593203
Island Peak (Imja Tse), 1:30,000, Nepa Maps, ISBN 10: 9993323004, ISBN 13: 9799993323005
Mera peak, 1:40000, Nepa Maps, ISBN: 9799993323012
Shorong/Hinku, 1:50000, Schneider Nepal Maps, ISBN: N000010238 

Climbing and Mountaineering

Mountains of the Mind: a History of a Fascination, Robert Macfarlane, Granta Books, ISBN-10: 1847080391, ISBN-13: 978-1847080394
Everest: The Mountaineering History, Unsworth, Baton Wicks Publications, ISBN-10: 1898573409, ISBN-13: 978-1898573401
The Climb: Tragic Ambitions on Everest, Anatoli Boukreev, Pan, ISBN-10: 0330488961, ISBN-13: 978-0330488969
The Kangchenjunga Adventure, Smythe, Pilgrims Publishing, ISBN-10: 8177690051, ISBN-13: 978-8177690057
The ascent of Rum Doodle, Bowman, Vintage Classics, ISBN-10: 0099530384, ISBN-13: 978-0099530381 
Kangchenjunga Challenge, Bauer, William Kimber, ASIN: B001374DDO
The Boardman Tasker Omnibus, Baton Wicks Publications, ISBN-10: 1898573123, ISBN-13: 978-1898573128

Annapurna Circuit trek

Culture, nature and camaraderie along the Annapurna Circuit.