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