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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Wetzel, Ralph M.
    Type: Article
    In: Bulletin of Carnegie Museum of Natural History
    Volume: 3
    Date: 1977
    Page Range: 1--36
    Publication Info: Pittsburgh, Carnegie Museum of Natural History, 1976-
  2. By: Wetzel, Ralph M. - Kock, Dieter
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 86
    Date: 1973
    Page Range: 25--33
    Publication Info: Washington, Biological Society of Washington,
  3. By: Wetzel, Ralph M.
    Type: Article
    In: Annals of the Carnegie Museum
    Volume: 49
    Date: 1980-09-05
    Page Range: 323--357
    Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-
  4. By: Wetzel, Ralph M.
    Type: Article
    In: Proceedings of the Biological Society of Washington
    Volume: 88
    Date: 1975-04-23
    Page Range: 95--112
    Publication Info: Washington, Biological Society of Washington,