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  1. By: Dykstra, C R - Hays, J L - Simon, M M - Daniel, F. Bernard
    Type: Article
    In: The journal of raptor research
    Volume: 37
    Issue: 3
    Date: 2003
    Page Range: 177--187
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Dykstra, C R - Hays, J L - Simon, M M - Holt, J B - Austing, G. Ronald - Daniel, F. Bernard
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 4
    Date: 2004
    Page Range: 304--311
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-