Thomas Cook Overseas Timetable
Probably the most adventurous timetable ever published... The famous Thomas Cook Overseas Timetable is the best place to find train, bus and ferry times for Singapore, Malaysia, Thailand or anywhere else in Asia, Africa, America, Australasia. Published every two months, it's a valuable resource for any serious overland traveller.
You can get a copy for £11 from any branch of Thomas Cook or online at www.thomascooktimetables.com (look for 'Timetables').

AIR AMERICA
From World War II to Vietnam. The story of the CIA's secret airline.
Author: Christpher Robbins. Publisher: Asia Books Co. Ltd. www.asiabooks.com
Originally published by Macmillan (Great Britain) 1979.
ISBN: 974-8303-51-9.
You might have seen the movie "Air America", well this is the true story of the secret war in Laos and lots of background on the Indo-China war.
Worth reading if you travel to Thailand/Laos/Cambodia/Vietnam to know what happened in the places you might visit.
Why are there Temple gongs made from artillery shells for sale in Udon Thani?
What's that abandoned airstrip doing in Vang Vieng that you walk across to get the bus?

VIETNAM:
The Fall of Saigon by David Butler: Possibly the best-researched and most readable account of the 1975 Communist takeover.
The Quiet American by Graham Greene: Set at the end of French rule, this is the most famous Western work of fiction on Vietnam. Much of the action takes place at the Continental Hotel and the Cao Dai complex in Tay Ninh.
The Lover by Marguerite Duras: A beautiful novel set in 1930s Saigon. It's also a feature film.