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  1. By: Zangerl, Rainer, - Johnson, Ralph Gordon,
    Publication info: [Chicago], Chicago Natural History Museum, 1957
    Holding Institution: Field Museum of Natural History Library
  2. By: Johnson, Ralph Gordon, - Richardson, Eugene S., (Eugene Stanley), Jr.
    Publication info: [Chicago], Field Museum Press, 1968
    Holding Institution: University Library, University of Illinois Urbana Champaign
  3. By: Johnson, Ralph Gordon, - Richardson, Eugene S., (Eugene Stanley), Jr.
    Publication info: [Chicago], Field Museum of Natural History, 1969
    Holding Institution: University Library, University of Illinois Urbana Champaign
  4. By: Thompson, Ida - Johnson, Ralph Gordon,
    Publication info: Chicago, Field Museum of Natural History, 1977
    Holding Institution: University Library, University of Illinois Urbana Champaign