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  1. By: Simpson, Robert C - Simpson, R Ann
    Type: Article
    In: Banisteria : a journal devoted to the natural history of Virginia
    Volume: 26
    Date: 2005
    Page Range: 17--17
    Publication Info: [Hampden-Sydney, Va.], Virginia Natural History Society, [1992]-
  2. By: Crossman, E. J. - Simpson, Robert C
    Type: Article
    In: The Canadian field-naturalist
    Volume: 98
    Issue: 4
    Date: 1984
    Page Range: 496--497
    Publication Info: Ottawa Ottawa Field-Naturalists' Club