Volume 1 of The Caves of Thailand covers the eastern and north-eastern provinces of Amnat Charoen, Bueng Kan, Buriram, Chachoengsao, Chaiyaphum, Chanthaburi, Chonburi, Kalasin, Khon Kaen, Loei, Mahasarakham, Mukdahan, Nakhon Nayok, Nakhon Phanom, Nakhon Ratchasima, Nong Bua LamPhu, Nong Khai, Prachinburi, Rayong, Roi Et, Sa Kaeo, Sakon Nakhon, Sisaket, Surin, Trat, Ubon Ratchathani, Udon Thani and Yasothon. Over 1,100 caves, rock shelters, stream sinks, resurgences and other sites of speleological interest are fully detailed, supported by 78 surveys and a bibliography with over 200 references.

“Xu Xiake's Travels” (徐霞客游记) is a Chinese travelogue book, written in the 17th century. The book has 22 sections. It consists mainly of essays describing the travels of the Ming dynasty geographer Xu Xiake. Over 34 years, Xu produced more than 600,000 words, including works such as "Guizhou tour diary" and "Yunnan tour diary". This book offers detailed descriptions of geography, hydrology, geology, plants and other phenomena. It is also respected for its literary qualities and for its historicity.