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