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  1. By: Robel, Robert J - Keating, Jeffrey F - Zimmerman, John L - Behnke, Keith C - Kemp, Kenneth E
    Type: Article
    In: The Wilson bulletin
    Volume: 109
    Issue: 2
    Date: 1997
    Page Range: 218--225
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Pitman, James C - Hagen, Christian A - Jamison, Brent E - Robel, Robert J - Loughin, Thomas M - Applegate, Roger D.
    Type: Article
    In: The Wilson journal of ornithology
    Volume: 118
    Issue: 1
    Date: 2006
    Page Range: 23--35
    Publication Info: Lawrence, KS, Wilson Ornithological Society, 2006-