The phylogeny of the oreodonts. Part 1. Merycoidodontinae Eporeodontinae, and Leptaucheniinae, three subfamilies of oreodonts, with an appendix to the revision of the Merycoidodontidae. Part 2. Summary and conclusions concerning the Merycoidodontidae. Bulletin of the American Museum of Natural History, 139 1968: 1-498. 291 [Zoological Record Volume 105]