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  1. De trilobitis : dissertatio petrefactologica ... / Hermanus Frider. Emmrich.
    By: Emmrich, Hermann Friedrich,
    Publication info: Berolini :Typis Nietackianis,1839.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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