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  1. By: Pac, Helga Ihsle, - Montana. Department of Fish, Wildlife, and Parks - United States. Bureau of Land Management.
    Publication info: [Helena?, Mont, The Dept.?, 1982?]
    Holding Institution: Montana State Library
  2. By: Pac, Helga Ihsle, - Frey, Kevin. - Montana. Department of Fish, Wildlife, and Parks
    Publication info: [Helena?], Montana Department of Fish, Wildlife & Parks, [1991]
    Holding Institution: Montana State Library
  3. By: Dood, Arnold R. - Pac, Helga Ihsle, - Montana. Department of Fish, Wildlife, and Parks
    Publication info: [Helena], Montana Department of Fish, Wildlife and Parks, [1993]
    Holding Institution: Montana State Library
  1. By: Pac, Helga Ihsle, - Kasworm, Wayne, - Irby, Lynn R. - Mackie, Richard J. (Richard John),
    Type: Article
    In: The Canadian field-naturalist
    Volume: 102
    Issue: 2
    Date: 1988
    Page Range: 227--236
    Publication Info: Ottawa Ottawa Field-Naturalists' Club