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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bergeron, Dwight. - Skaar, Palmer David.
    Edition: 4th ed.
    Publication info: Helena, Montana Natural Heritage Program, 1992
    Holding Institution: Montana State Library
  2. By: Lenard, Susan - Carlson, John C. - Ellis, Janet H. - Jones, Cedron - Tilly, Chuck - Skaar, Palmer David.
    Edition: 6th ed.
    Publication info: Helena, Montana Natural Heritage Program, 2003
    Holding Institution: Montana State Library
  3. By: Skaar, Palmer David. - Montana Bird Distribution Committee.
    Edition: 5th ed.
    Publication info: [Helena, MT], Montana Natural Heritage Program, 1996
    Holding Institution: Montana State Library