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  1. By: Kennedy, W. J. (William James) - Cobban, William Aubrey, - Landman, Neil H.
    Publication info: New York, NY, American Museum of Natural History, c1999
    Holding Institution: American Museum of Natural History Library
    Subjects: Ammonoidea  Cretaceous  Didymoceras cochleatum  Mollusks, Fossil  Niobrara County  Paleontology  Pierre Shale  South Dakota  Wyoming  
  2. By: Osborn, Henry Fairfield, - Brown, Barnum, - Kaisen, Peter C. - Sternberg, Charles H. (Charles Hazelius),
    Publication info: New York City, The American Museum of Natural History, [1933]
    Holding Institution: American Museum of Natural History Library
    Subjects: 56.81,9T  Montana  Niobrara County  Paleontology  Skeleton  Triceratops elatus  Wyoming
  3. By: Mook, Charles Craig,
    Publication info: New York City, The American Museum of Natural History, [1941]
    Holding Institution: American Museum of Natural History Library
    Subjects: Cretaceous  Crocodilians, Fossil  Lance Formation (Colo. and Wyo.)  Niobrara County  Paleontology  Prodiplocynodon langi  Reptiles, Fossil  Skull  Wyoming
  4. By: Auffenberg, Walter, - Goin, Coleman J. (Coleman Jett), - Cope, E. D. (Edward Drinker),
    Publication info: New York, N.Y, American Museum of Natural History, [1959]
    Holding Institution: American Museum of Natural History Library
    Subjects: 56.76(117:7)  Alberta  Amphibians, Fossil  Cretaceous  Hemitrypus  Montana  Niobrara County  Paleontology  Salamanders, Fossil  Scapherpetonidae  Wyoming