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By "Iowa Geological Survey "
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.
Publication info: Des Moines :Printed and Pub. by Mills,1870.
Contributed by: Smithsonian Libraries