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<br />~ <br /> <br />DEPARTMENT OF THE INTERIOR <br /> <br />DONALD PAUL HODEL, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Dallas L. Peck, Director <br /> <br />For additional information <br />write to: <br /> <br />Copies of this report can be <br />purchased from: <br /> <br />District Chief <br />U.S. Geological Survey <br />2120 Capitol Avenue <br />P. O. Box 1125 <br />Cheyenne, WY 82003 <br /> <br />U.S. Geological Survey <br />Books and Open-File Reports Section <br />Federal Center, Bldg. 810 <br />Box 25425 <br />Denver, CO 80225 <br /> <br />- <br />