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  1. By: Langdon, Frank Warren,
    Publication info: Salem, Mass, The Naturalist's Agency, 1877
    Holding Institution: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
  2. By: Langdon, Frank Warren,
    Publication info: Cincinnati, Barclay, 1879
    Holding Institution: Multiple institutions
  1. By: Langdon, Frank Warren,
    Type: Article
    In: The Auk
    Volume: 4
    Date: 1887
    Page Range: 125--133
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-
  2. By: Langdon, Frank Warren,
    Type: Article
    In: The Auk
    Volume: 3
    Date: 1886
    Page Range: 485--485
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-