Gravigrade edentates in lower Grand Canyon, Arizona [abs.], in Geological Society of America, Annual Meeting, 49th, 1936, Proceedings
Schenk, E.T., 1937, Gravigrade edentates in lower Grand Canyon, Arizona [abs.], in Geological Society of America, Annual Meeting, 49th, 1936, Proceedings: Geological Society of America, p. 399.