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By: Coryell, Horace Noble, - Salmon, Eleanor Seely, - Wasson, Theron,Edition:Publication info: New York City, The American Museum of Natural History, [1934]Volume: no.746 (1934)Series:Holding Institution: American Museum of Natural History LibrarySubjects: 56.4(117:78.6) Cretaceous Dawson County Mollusks, Fossil Montana PaleontologyBHL Collections: