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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Kayser, Charles,
    Type: Article
    In: Journal für Ornithologie
    Volume: 68
    Date: 1920
    Page Range: 326--340
    Publication Info: Berlin, Friedländer,
  2. By: Kayser, Charles,
    Type: Article
    In: Journal für Ornithologie
    Volume: 69
    Date: 1921
    Page Range: 218--239
    Publication Info: Berlin, Friedländer,