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<br />U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br />Charles G. Groat, Director <br /> <br />The use of firm, trade, and brand names in this report is for identification purposes only and does not <br />constitute endorsement by the U,S, Government. <br /> <br />For additional information write to: <br /> <br /> <br />District Chief <br />U.S. Geological Survey <br />3916 Sunset Ridge Road <br />Raleigh, NC 27607 <br /> <br />Copies of this report can be purchased <br />from: <br /> <br />U.S. Geological Survey <br />Information Services <br />Box 25286, Federal Center <br />Denver, CO 80225 <br />