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  1. Demographic monitoring of three species of Botrychium (Ophioglossaceae) in Waterton Lakes Park, Alberta : 1993 progress report / Peter Lesica and Kathy Ahlenslager.
    By: Lesica, Peter. - Ahlenslager, Kathleen E. - Montana Natural Heritage Program. - U.S. Fish and Wildlife Service.
    Publication info: Missoula, Mont. :Herbarium, Division of Biological Science, University of Montana,[1994]
    Contributed by: Montana State Library (archive.org)
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