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  1. By: Osborn, Dale J., - Helmy, Ibrahim.
    Publication info: [Chicago], Field Museum of Natural History, 1980
    Holding Institution: University Library, University of Illinois Urbana Champaign
  1. By: Osborn, Dale J.,
    Type: Article
    In: Bulletin
    Volume: 39
    Issue: 3
    Date: 1968
    Page Range: 2--14
    Publication Info: [Chicago], The Museum, 1966-1972
  2. By: Osborn, Dale J.,
    Type: Article
    In: Field Museum of Natural History bulletin
    Volume: 48
    Issue: 9
    Date: 1977
    Page Range: 10--13
    Publication Info: [Chicago, Ill.], The Museum, [1972]-©1990