The Unknown North of Laos. (Part 6 - 2014-2015: Karst and Caves of the Provinces Luang Prabang, Houaphan, Oudomxay and Xieng Khouang). BHB Volume 63
M. Laumanns (Ed.): The Unknown North of Laos. (Part 6 - 2014-2015: Karst and Caves of the Provinces Luang Prabang, Houaphan, Oudomxay and Xieng Khouang). 115 pp., colour photo tables, many maps & surveys; Berlin 2016. This volume presents the results of the 2014 and 2015 international expeditions to Northern Laos and describes a total of 23 km of passages from 70 caves. Includes the Tham Houay Ngot-Pang Ngoy System (3,620 m long) and Tham Lo (2,103 m), both in Houaphan, as well as Tham Nam Lod (1,796 m long) from Luang Prabang province. In English with German and French abstracts.
 "The Unknown North of Laos. (Part 6 - 2014-2015: Karst and Caves of the Provinces Luang Prabang, Houaphan, Oudomxay and Xieng Khouang). BHB Volume 63")
