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  1. By: Barton, Drake. - Crispin, Sue. - Montana Natural Heritage Program.
    Publication info: Helena, Mont. :Montana Natural Heritage Program,c2003.
    Holding Institution: Montana State Library (archive.org)
  2. By: Barton, Drake. - Crispin, Sue. - Montana Natural Heritage Program.
    Publication info: Helena, Mont. :Montana Natural Heritage Program,c2002.
    Holding Institution: Montana State Library (archive.org)