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  1. By: Plumpton, D L - Downing, D I - Andersen, David E - Lockhart, J M
    Type: Article
    In: The journal of raptor research
    Volume: 29
    Issue: 2
    Date: 1995
    Page Range: 141--143
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-