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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Tratz, Eduard Paul
    Type: Article
    In: Journal für Ornithologie
    Volume: 67
    Date: 1919
    Page Range: 129--158
    Publication Info: Berlin, Friedländer,
  2. By: Tratz, Eduard Paul
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 37
    Date: 1914
    Page Range: 123--172
    Publication Info: Jena [Germany], G. Fischer,