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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hoff, C. Clayton (Clarence Clayton), - Clawson, David L.
    Publication info: New York, American Museum of Natural History, [1952]
    Holding Institution: American Museum of Natural History Library
  2. By: Clawson, David L. - Hoff, C. Clayton (Clarence Clayton),
    Publication info: 1952
    Holding Institution: American Museum of Natural History Library