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  1. Zoogeographical reviews. Fifty years of American ornithology
    By: Ricklefs, R E - Gill, F B
    Type: Article
    In: Bulletin of the British Ornithologists' Club.
    Volume: 100
    Date: 1980
    Page Range: 118--122
    Publication info: London :British Ornithologists' Club,1893-
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