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By: Yen, Teng-Chien - Brown, Barnum, - Brown Vertebrate Paleontology ExpeditionEdition:Publication info: New York American Museum of Natural History [1951]Volume: no.1481 (1951)Series:Holding Institution: American Museum of Natural History LibrarySubjects: 56.4,1P(117:78.6) Big Horn County Bivalves, Fossil Cretaceous Mollusks, Fossil Montana PaleontologyBHL Collections: