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  1. By: Harris, W C
    Type: Article
    In: Proceedings of the Zoological Society of London
    Volume: 6
    Date: 1838
    Page Range: 1--3
    Publication Info: London Academic Press, [etc.] 1833-1965
  2. By: Duncan, P A - Harris, W C
    Type: Article
    In: The journal of raptor research
    Volume: 31
    Issue: 2
    Date: 1997
    Page Range: 187--190
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-