Talübertiefung im Grand Canon des Colorado, in Memorial volume of the Transcontinental Excursion of 1912 of the American Geographical Society of New York

Drygalski, Erich von, 1915, Talübertiefung im Grand Canon des Colorado, in Memorial volume of the Transcontinental Excursion of 1912 of the American Geographical Society of New York: American Geographical Society of New York, p. 343-348.