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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bell, Ernest Layton.
    Publication info: New York, N.Y, American Museum of Natural History, [1959]
    Holding Institution: American Museum of Natural History Library
  2. By: Bell, Ernest Layton.
    Publication info: New York, N.Y, American Museum of Natural History, [1956]
    Holding Institution: American Museum of Natural History Library
  3. By: Bell, Ernest Layton.
    Publication info: New York, American Museum of Natural History, [1949]
    Holding Institution: American Museum of Natural History Library