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  1. Die Nordamerikanische Vogelwelt /
    By: Nehrling, Henry, - Ridgway, Robert,
    Publication info: Milwaukee, Wis. :G. Brumber,1891.
    Holding Institution: Smithsonian Libraries
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  2. Die Nord-Amerikanische Vogelwelt.
    By: Nehrling, Henry, - Ridgway, Robert,
    Publication info: Milwaukee, Wis.,G. Brumder[1889]-91.
    Holding Institution: American Museum of Natural History Library
    View Book