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  1. By: Rowan, William, - Wolf . - Sulman, P L - Pearson, Karl - Isaacs, E - Elderton, E M - Tildesley, M.
    Type: Article
    In: The Auk
    Volume: 37
    Date: 1920
    Page Range: 479--480
    Publication Info: Washington, D.C, American Ornithologists' Union, etc, 1884-