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  1. By: Crowder, A. A. - Harmsen, R.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 112
    Issue: 3
    Date: 1998
    Page Range: 410--418
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Crowder, A. A. - Harmsen, R. - Blatt, Suzanne.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 121
    Issue: 2
    Date: 2007-04-01
    Page Range: 182--190
    Publication Info: Ottawa Ottawa Field-Naturalists' Club