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  1. Observations on terrestrial magnetism in Mexico Conducted under the direction of Baron von Müller, with notes and illustrations of an examination of the volcano Popocatepetl and its vicinity. By August Sonntag
    By: Sonntag, August. - Mueller, Ferdinand von, - Making of America Project.
    Publication info: Washington,Smithsonian Institution,1860
    Contributed by: University of California Libraries (archive.org)
    Subjects: Electronic texts  Geomagnetism  Mexico  Online resources  Popocatépetl (Mexico)  
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