The French In Indochina. (PDF file, 370 K). This 1883 edition is a true classic of early Western writing on Southeast Asia. The line drawings from The French in Indochina can be found in a web photo gallery.
Siam (PDF file, 1 Mb) by Pierre Loti. published around 1902. 29,000 words. The book's pictures are in a web photo gallery.