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  1. By: Ponder, Eric - Yeager, J. Franklin - Charipper, Harry A.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 11
    Issue: 1
    Date: 1928-12-05
    Page Range: 1--7
    Publication Info: New York,
  2. By: Ponder, Eric - Yeager, J. Franklin - Charipper, Harry A.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 11
    Issue: 2
    Date: 1929-02-28
    Page Range: 9--18
    Publication Info: New York,