Keyes, Charles, 1936, Passing of Supai as terranal title: Pan-American Geologist, v. 66, no. 4, p. 311-313.
Pan-American Geologist, v. 66, no. 4, p. 311-313.
Stratigraphy, Correlation, History, [Supai Fm][Supai Group] - Pennsylvanian/Permian, (Aubrey Group),