This is an index of books completed by the volunteers of Project Gutenberg Thailand. All books below are free and in the public domain, which means they are not restricted by any copyright.
- (1771) History of the Kingdom of Siam and the Revolutions that Have Caused the Overthrow of the Empire, up to A.D. 1770, by F.H. Turpin
- (1871) Siam: Its Government, Manners, Customs, &c., by N. Abraham McDonald
- (1880) Progress of Western Education in China and Siam, by U.S. Dept. of Interior
- (1898) Jungle and Stream, or the Adventures of Two Boys in Siam, by George Manville Fenn
- (1895) Notes of a Journey on the Upper Mekong, Siam, by H. Warington Smyth
- (1922) Buddhism in the Modern World, by Kenneth J. Saunders
- (1943) Siam–Land of Free Men, by H. G. Deignan