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  1. Notes on North American Earthworms of the genus Diplocardia
    By: Eisen, Gustav
    Type: Article
    In: Zool Bull
    Volume: 2
    Date: 1898
    Page Range: 161--172
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  2. Researches in American oligochaeta, with especial reference to those of the Pacific coast and adjacent islands
    By: Eisen, Gustav
    Type: Article
    In: Proceedings of the California Academy of Sciences
    Volume: 2
    Series: 3
    Date: 1900
    Page Range: 85--268
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