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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Klopfer, Peter H
    Type: Article
    In: The Wilson bulletin
    Volume: 77
    Issue: 4
    Date: 1965
    Page Range: 376--381
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Klopfer, Peter H
    Type: Article
    In: The Wilson bulletin
    Volume: 79
    Issue: 3
    Date: 1967
    Page Range: 290--300
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  3. By: Klopfer, Peter H
    Type: Article
    In: The Wilson bulletin
    Volume: 71
    Issue: 3
    Date: 1959
    Page Range: 262--266
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  4. By: Sheppard, David H - Klopfer, Peter H - Oelke, Hans
    Type: Article
    In: The Wilson bulletin
    Volume: 80
    Issue: 4
    Date: 1968
    Page Range: 452--457
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-