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  1. By: Marsden, C A - Wright, P L
    Type: Article
    In: The entomologist's record and journal of variation
    Volume: 83
    Date: 1971
    Page Range: 179--186
    Publication Info: [London s.n
  2. By: Holt, D W - Hoy, J A - Wright, P L
    Type: Article
    In: The journal of raptor research
    Volume: 21
    Issue: 3
    Date: 1987
    Page Range: 120--121
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-