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  1. By: Billings, Walter R.
    Type: Article
    In: The Ottawa naturalist
    Volume: 4
    Issue: 3
    Date: 1890-06
    Page Range: 41--51
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,
  2. By: Billings, Walter R.
    Type: Article
    In: The Ottawa naturalist
    Volume: 1
    Issue: 4
    Date: 1887-07
    Page Range: 49--54
    Publication Info: Ottawa, Ottawa Field-Naturalists' Club,