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  1. Report of the Superintendent of the Geological Survey, exhibiting the progress of the work, January 1, 1861.
    By: Wisconsin Geological and Natural History Survey. - Hall, James,
    Publication info: Madison,E.A. Calkins & Co.,1861.
    Contributed by: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
    BHL Collections: Ernst Mayr Library of the MCZ, Harvard University
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