Scaphitoid cephalopods of the Colorado group. Evolution of Scaphites and related genera, with descriptions and illustrations of new species and a new genus from western interior United States. - Cobban, William Aubrey, 1916- (Washington, U.S. Govt. Print. Off., 1951)
"References": p. 39.
Keywords: Ammonoidea; Scaphites; Paleontology -- Cretaceous