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  1. By: Walters, Eric L - Miller, Edward H
    Type: Article
    In: The Canadian field-naturalist
    Volume: 115
    Issue: 3
    Date: 2001
    Page Range: 413--419
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Koenig, Walter D, - Walters, Eric L - Pearse, Ian S - Carmen, William J - Knops, Johannes M H
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 61
    Date: 2014
    Page Range: 151--158
    Publication Info: Berkeley, California Botanical Society,
  3. By: Baird, Robin William - Walters, Eric L - Stacey, Pam Joyce
    Type: Article
    In: The Canadian field-naturalist
    Volume: 107
    Issue: 4
    Date: 1993
    Page Range: 466--480
    Publication Info: Ottawa Ottawa Field-Naturalists' Club