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  1. By: Breder, Charles M. (Charles Marcus), - Crawford, Donald R.
    Type: Article
    In: Zoologica : scientific contributions of the New York Zoological Society
    Volume: 2
    Issue: 14
    Date: 1922-08-15
    Page Range: 287--327
    Publication Info: New York,
  2. By: Kendall, William Converse, - Crawford, Donald R.
    Type: Article
    In: Journal of the Washington Academy of Sciences
    Volume: 12
    Date: 1922
    Page Range: 8--19
    Publication Info: Washington [etc Washington Academy of Sciences]