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  1. A possible new subspecies of the Philippine Hawk-Eagle (Spizaetus philippensis) and its future prospects
    By: Preleuthner, M - Gamauf, A
    Type: Article
    In: The journal of raptor research.
    Volume: 32
    Issue: 2
    Date: 1998
    Page Range: 126--135
    Publication info: Hastings, Minn. :Raptor Research Foundation,©1987-
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