Palæontology. Volume II, cretaceous and Tertiary fossils, 1869
United States Geological exploration of the fortieth parallel. [Volume IV], Pt.I.
Palaeontology, by F. B. Meek. Pt.II. Palaeontology, by James Hall and R. P. Whitfield.
Pt. III. Ornithology, by Robert Ridgway, 1877