Observations on terrestrial magnetism in Mexico. [electronic resource] Conducted under the direction of Baron von Moller, with notes and illustrations of an examination of the volcano Popocatepetl and its vicinity. By August Sonntag ...
Washington, Smithsonian institution; New York, D. Appleton & co., 1860]
Electronic text and image data. Ann Arbor, Mich. : University of Michigan, Digital Library Initiatives, 2000. Includes both TIFF files and keyword searchable text. [Making of America] This volume is made possible by a grant from the Andrew W. Mellon Foundation as part of Making of America IV: the American voice, 1850-1877.