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  1. Beiträge zur Geologie von Kamerun,
    By: Esch, Ernst, - Jaekel, Otto Max Johannes, - Oppenheim, Paul, - Solger, Friedrich, - Germany.
    Publication info: Stuttgart,E. Schweizerbartsche Verlagsbuchhandlung (E. Nägele),1904.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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  2. Die eocänen Selachier vom Monte Bolca : ein Beitrag zur Morphogenie der Wirbelthiere / von Otto Jaekel.
    By: Jaekel, Otto Max Johannes,
    Publication info: Berlin :J. Springer,1894.
    Contributed by: Harvard University, MCZ, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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