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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Schaeffer, Bobb, - Dunkle, David H. - McDonald, Nicholas G.
    Publication info: Chicago, Field Museum of Natural History, 1975
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: McDonald, Nicholas G. - Schaeffer, Bobb,
    Publication info: 1978
    Holding Institution: American Museum of Natural History Library