Plesippus francescana (Frick) From the Late Pliocene, Coso Mountains, California with a Review of the Genus Plesippus

Pp. 13; 3 full page black-and-white plates, 3 text-figures (line-drawings).  Original printed gray wrappers, lg8vo.  Carnegie Institution of Washington Publication no. 473.  Plesippus is often considered an intermediate stage between Dinohippus and the extant genus, Equus (after Wiki).  From the research library of marine mammal paleontologist, Edward D. Mitchell, with his signature on the front wrapper.  No other ownership marks.