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  1. By: Smith, B W - Belthoff, J 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: Moulton, C E - Brady, R S - Belthoff, J R
    Type: Article
    In: The journal of raptor research.
    Volume: 39
    Issue: 4
    Date: 2005
    Page Range: 429--438
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-
  3. By: Belthoff, J R - Sparks, E J - Ritchison, G
    Type: Article
    In: The journal of raptor research.
    Volume: 27
    Issue: 1
    Date: 1993
    Page Range: 8--15
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-
  4. By: Smith, B W - Belthoff, J 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-
  5. By: Belthoff, J R
    Type: Article
    In: The journal of raptor research.
    Volume: 21
    Issue: 2
    Date: 1987
    Page Range: 80--81
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-