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  1. By: Olson, Everett Claire, - Roy, Sharat Kumar, - Ross, Lillian A.
    Publication info: [Chicago], Chicago Natural History Museum Press, 1951
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Diplocaulus
  2. By: Olson, Everett Claire,
    Publication info: Chicago, Chicago Natural History Museum, 1952
    Holding Institution: Field Museum of Natural History Library
    Subjects: Diplocaulus  Paleontology  Permian  Texas