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  1. By: Simpson, Donald Ray,
    Publication info: Chicago, Ill, Field Museum of Natural History, 1972
    Holding Institution: University Library, University of Illinois Urbana Champaign
  2. By: Simpson, Donald Ray,
    Publication info: Chicago, Ill, Field Museum of Natural History, 1976-
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Simpson, Donald Ray,
    Type: Article
    In: Field Museum of Natural History bulletin
    Volume: 43
    Issue: 4
    Date: 1972
    Page Range: 12--15
    Publication Info: [Chicago, Ill.], The Museum, [1972]-©1990
  2. By: Simpson, Donald Ray,
    Type: Article
    In: Bulletin
    Volume: 41
    Issue: 4
    Date: 1970
    Page Range: 13--13
    Publication Info: [Chicago], The Museum, 1966-1972
  3. By: Simpson, Donald Ray,
    Type: Article
    In: Fieldiana
    Volume: 36
    Date: 1976
    Page Range: 125--164
    Publication Info: [Chicago], Chicago Natural History Museum, 1958-