Berta, Annalisa New specimens of the Pinnipediform Pteronarctos from the Miocene of Oregen Annalisa Berta - Washington Smithsonian Institution Press 1994 - iii, 30 p. : ill. ; 28 cm. - Smithsonian contributions to paleobiology no. 78 . (p. 30) Subjects--Topical Terms: Pteronarctos--OregonPalaeontology--MiocenePalaeontology--Oregon