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  1. By: Klopfer, Peter
    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 - 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-