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  1. Johann Gottlob Krügers Gedancken von den Stein-Kohlen.
    By: Krüger, Johann Gottlob, - U.S. Geological Survey Library,
    Publication info: Halle :Verlegts, Carl Herrmann Hemmerde,1741.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Institution Libraries
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