Forman 1814 c1: Kenanpo, cave-city on Yellow River bordering Shensi [Shaanxi] and Shansi [Shanxi] provinces. Caves are cut into loess hills. They are warm in winter, cool in summer, and cost only a man's labor. Forman 1814 c3: Cave dwellings in loess Northlands reclaimed for resettlement in Sinkiang province [now Xinjiang Uygur Zizhiqu autonomous region], bordering the Tien Shan mts.
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