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  1. By: Snyder, Dana P. - Cassel, J. Frank,
    Type: Article
    In: The Wilson bulletin
    Volume: 63
    Issue: 3
    Date: 1951
    Page Range: 177--180
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Snyder, Dana P.
    Type: Article
    In: Annals of the Carnegie Museum
    Volume: 33
    Date: 1954
    Page Range: 201--234
    Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-