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  1. Ferruginous hawk (Buteo regalis) inventories on the Dillon Resource Area of southwest Montana; 1992 / by Eric C. Atkinson for the Bureau of Land Management, Dillon Resource Area.
    By: Atkinson, Eric C. - Montana Natural Heritage Program. - United States.
    Publication info: Helena, MT :Montana Natural Heritage Program,[1992]
    Contributed by: Montana State Library (archive.org)
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