Culture Shock! Thailand & How to Survive It by Robert Nanthapa Cooper.
Thailand: A Short History by David Wyatt.
Hill Tribes of Northern Thailand by Gordon Young.
Part of Spalding Gray's Swimming to Cambodia is a humorous account of being on location in Thailand while playing a minor role in The Killing Fields.
There's a chapter on Thailand in Pico Iyer's Video Night in Kathmandu.
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