Historical Photographs of China reference for this set: Nh06. North Journey 北部之旅.
Tsao Tien-Chin (Cao Tianqin 曹天欽) pointing at a hole in the loess soil at the Soil Conservation Service experimental station, Tienshui (Tianshui) 天水, Kansu (Gansu) 甘肅
Photographs from the collection may be reproduced only with written permission. For permissions, contact the Librarian, East Asian History of Science Library, Needham Research Institute. Further information about the library and the ‘Joseph Needham Photographs – Wartime China, 1943-1946’: http://www.nri.cam.ac.uk/JN_wartime_photos/home.htm