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  1. By: Becker, Dale M. - Sieg, C H
    Type: Article
    In: Raptor research
    Volume: 19
    Issue: 2-3
    Date: 1985
    Page Range: 52--55
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  2. By: Becker, Dale M.
    Type: Article
    In: Raptor research
    Volume: 19
    Issue: 2-3
    Date: 1985
    Page Range: 102--102
    Publication Info: Vermillion, S.D, Raptor Research Foundation, [1972-1986]
  3. By: Becker, Dale M. - Sieg, Carolyn Hull.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 3
    Date: 1997
    Page Range: 369--372
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Becker, Dale M. - Sieg, Carolyn Hull.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 3
    Date: 1997
    Page Range: 398--403
    Publication Info: Ottawa Ottawa Field-Naturalists' Club