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  1. By: Sidle, J G - Ball, Mark. - Byer, Timothy - Chynoweth, J J - Foli, Gary - Hodorff, R - Moravek, G - Peterson, Richard - Svingen, D N
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 4
    Date: 2001
    Page Range: 316--321
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Murphy, R K - Hasselblad, K W - Grondahl, C D - Sidle, J G - Martin, R E - Freed, D W
    Type: Article
    In: The journal of raptor research
    Volume: 35
    Issue: 4
    Date: 2001
    Page Range: 322--330
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-