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  1. By: Northrop, John I
    Type: Article
    In: The Auk
    Volume: 8
    Date: 1891
    Page Range: 64--80
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  2. By: Northrop, John I
    Type: Article
    In: Torreya
    Volume: 1
    Issue: 12
    Date: 1901
    Page Range: 141--142
    Publication Info: Burlington, Vt, Torrey Botanical Club, 1901-1945