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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Batten, Roger Lyman
    Publication info: New York, N.Y, American Museum of Natural History, c1989
    Holding Institution: American Museum of Natural History Library
    Subjects: Gastropoda, Fossil  Mollusks, Fossil  Paleontology  Permian  Pleurotomariacea  Southwestern States