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  1. By: Palmer, Ralph S
    Type: Article
    In: The Wilson bulletin
    Volume: 52
    Issue: 4
    Date: 1940
    Page Range: 278--278
    Publication Info: Columbus, Ohio, Wilson Ornithological Society, 1894-
  2. By: Grinnell, J - Palmer, Ralph S
    Type: Article
    In: The Canadian field-naturalist
    Volume: 55
    Issue: 4
    Date: 1941-03
    Page Range: 49--54
    Publication Info: Ottawa Ottawa Field-Naturalists' Club