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  1. By: Gerhardt, Ulrich
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 35
    Date: 1913
    Page Range: 415--532
    Publication Info: Jena [Germany], G. Fischer,
  2. By: Gerhardt, Ulrich
    Type: Article
    In: Zoologische Jahrbücher
    Volume: 37
    Date: 1914
    Page Range: 1--64
    Publication Info: Jena [Germany], G. Fischer,