Gazin, Charles Lewis, 1904-. Mammalian faunal zones of the Bridger middle Eocene / C. Lewis Gazin. - Washington : Smithsonian Institution Press, 1976. - iii, 25 p. ; 26 cm. - Smithsonian contributions to paleobiology ; no.26 . Bibliography: p. 13-25. LCCN: 75-61967 Subjects--Topical Terms: Mammals, Fossil--West (U.S.).Paleontology--Eocene.Paleontology--West (U.S.).