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  1. By: Gard, Nicholas William - Bird, David M. (David Michael), - Densmore, R - Hamel, M
    Type: Article
    In: The journal of raptor research
    Volume: 23
    Issue: 3
    Date: 1989
    Page Range: 99--102
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-