01067cam a22003011 4500 gs 52000121 DLC 20260227111358.0 801205s1951 dcuaf b f001 0 eng c gs 52000121 (OCoLC)7003545 U.S. Geol. Survey. Libr. NcGrE ISS DLC n-us--- QE75 .P9 no. 239 QE807.A5 C6 564.53 I 19.16:239 Cobban, William Aubrey, 1916- 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. Washington, U.S. Govt. Print. Off., 1951. iii, 42 p. illus., 21 plates. 29 cm. Geological Survey professional paper 239 "References": p. 39. Ammonoidea. Scaphites. Paleontology Cretaceous. Geological Survey (U.S.). Professional paper ; 239. 28636 28636