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  1. By: Ritchie, Robert J - Doyle, T J - Wright, John M.
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 3
    Date: 1998
    Page Range: 261--264
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Ritchie, Robert J - Wildman, Ann M. - White, Clayton M.
    Type: Article
    In: The journal of raptor research
    Volume: 38
    Issue: 2
    Date: 2004
    Page Range: 158--160
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  3. By: Ritchie, Robert J - Burgess, Robert M. - Suydam, Robert S.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 114
    Issue: 3
    Date: 2000
    Page Range: 395--404
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  4. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 106
    Issue: 3
    Date: 1992
    Page Range: 316--320
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  5. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 92
    Issue: 3
    Date: 1978
    Page Range: 293--293
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  6. By: Ritchie, Robert J - Ambrose, Robert E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 101
    Issue: 1
    Date: 1997
    Page Range: 86--87
    Publication Info: Ottawa Ottawa Field-Naturalists' Club