1. The continuity of development Author(s): Matthew, William Diller, 1871-1930, author Publication: [New York?] : [publisher not identified], [1910?] Subject(s): Biological EvolutionFossilsArtiodactylaNorth America
2. Hippopotame Publication: Bethesda, MD : U.S. National Library of Medicine, National Institutes of Health, Health & Human Services, 2009 Subject(s): ArtiodactylaSkeletonBone and Bones
