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  1. Report on the geological survey of the State of Iowa, to the Thirteenth General Assembly, January, 1870, containing results of examinations and observations made within the years 1866, 1867, 1868, and 1869.
    By: Iowa Geological Survey - Emery, Rush. - Parvin, Theodore Sutton, - St. John, O. H. - White, Charles A. - Iowa Geological Survey
    Publication info: Des Moines :Printed and Pub. by Mills,1870.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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