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  1. By: Frivaldszky, János, - International Ornithological Congress Budapest, Hungary
    Publication info: Budapestini :Typis Societatis Frankli1891.
    Holding Institution: American Museum of Natural History Library
  2. By: Sharpe, Richard Bowdler, - International Ornithological Congress Budapest, Hungary
    Publication info: Budapest :Pub. at the office of the congress,1891.
    Holding Institution: Smithsonian Libraries