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  1. By: Smith, B W - Belthoff, James R.
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 4
    Date: 2001
    Page Range: 385--391
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Smith, B W - Belthoff, James R.
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 2
    Date: 2001
    Page Range: 159--161
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-