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<br /> <br />DEPARTMENT OF THE INTERIOR <br />DONALD PAUL HODEL, SECRETARY <br />U.S. GEOLOGICAL SURVEY <br /> <br />DALLAS L. PECK, DIRECTOR <br /> <br />.1 <br /> <br /> <br />For additional information <br /> <br />Copies of this <br />purchased from: <br /> <br />write to: <br /> <br />U.S. Geological Survey <br />Water Resources Division <br />Box 1230 <br />Iowa city, Iowa 52244 <br />Telephone: (319) 337-4191 <br />