Tiers of cave-dwellings in loess northlands reclaimed for resettlement in Sinkiang province [now Xinjiang Uygur Zizhiqu (autonomous region)] bordering Tien Shan mountains.
Harrison Forman Diary, China, May-June 1944, Part 1 available at http://collections.lib.uwm.edu/u?/forman,51; Forman, H. (1946). Report from Red China. London: Robert Hale Limited