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  1. P.D. Skaar's Montana bird distribution / revised by the Montana Bird Distribution Committee.
    By: Skaar, Palmer David. - Montana Bird Distribution Committee.
    Edition: 5th ed.
    Publication info: [Helena, MT]:Montana Natural Heritage Program,1996
    Contributed by: Montana State Library (archive.org)
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  2. P.D. Skaar's Montana bird distribution /
    By: Montana Bird Distribution Committee. - Cilimburg, Amy. - Currier, Coburn. - Ellis, Janet. - Hendricks, Paul. - Lenard, Susan. - Maxell, Bryce A. - Story, Scott. - Sullivan, Dan. - Wightman, Catherine. - Montana Audubon. - Montana Natural Heritage Program. - Montana.
    Edition: 7th ed.
    Publication info: Helena :Montana Natural Heritage Program,2012
    Contributed by: Montana State Library (archive.org)
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