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  1. By: Hempel, Adolph
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 8
    Series: 7
    Date: 1901
    Page Range: 62--72
    Publication Info: London Taylor and Francis, Ltd
  2. By: Hempel, Adolph
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 7
    Series: 7
    Date: 1901
    Page Range: 110--125
    Publication Info: London Taylor and Francis, Ltd
  3. By: Hempel, Adolph
    Type: Article
    In: The Annals and magazine of natural history; zoology, botany, and geology
    Volume: 8
    Series: 7
    Date: 1901
    Page Range: 383--391
    Publication Info: London Taylor and Francis, Ltd