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  1. By: Walker, Charles Frederic - Duellman, William E. (William Edward),
    Type: Article
    In: Occasional papers of the Museum of Natural History, the University of Kansas
    Volume: 26
    Date: 1974
    Page Range: 1--6
    Publication Info: Lawrence, Kan, The University, 1971-1994
  2. By: Walker, Charles Frederic
    Type: Article
    In: Occasional papers of the Museum of Natural History, the University of Kansas
    Volume: 20
    Date: 1973
    Page Range: 1--7
    Publication Info: Lawrence, Kan, The University, 1971-1994