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  1. Die Versteinerungen des nord-deutschen Kreidegebirges / von Friedrich Adolph Roemer.
    By: Roemer, Friedrich Adolph,
    Publication info: Hannover :Hahn,1840-1841.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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