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  1. By: Klopfer, Peter Hubert
    Type: Article
    In: The Wilson bulletin
    Volume: 75
    Issue: 1
    Date: 1963
    Page Range: 15--22
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Pulliam, Ronald - Gilbert, Barrie - Klopfer, Peter Hubert - Mcdonald, Dennis - Mcdonald, Linda - Millikan, George
    Type: Article
    In: The Wilson bulletin
    Volume: 84
    Issue: 1
    Date: 1972
    Page Range: 77--89
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-