1954 36 p., 4 pls, wrappers. Library stamps of: Harold Feinberg & Norman Newell. Reprint from: Bulletins of American Paleontology.
1941 79 p., 19 plates, paperbound (back cover detached). Proceedings of the Academy of Natural Sciences of Philadelphia. Unopened copy.With descriptions of many new and poorly known species. Well-illustated.