Print 1790 c1: The crude oil coming in from primitively-operated oil well in Shensi [Shaanxi] province. Print 1790 c2: Crude oil as pumped from oil well in Shensi [Shaanxi] province, north China (near Yenchang [Yanchang]).
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