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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Moore, Joseph Curtis
    Publication info: New York, N.Y, American Museum of Natural History, [1961]
    Holding Institution: American Museum of Natural History Library
    Subjects: 59.9,32S(7/8)  America  Bering Land Bridge  Dispersal  Geographical distribution  Mammals, Fossil  Paleontology  Panama  Panama, Isthmus of  Pleistocene  Pliocene  Squirrels  Squirrels, Fossil