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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 <br />not constitute endorsement by the U,S. Geological Survey, <br /> <br />For additional information write to: <br /> <br />Copies of this report can be purchased <br />from: <br /> <br />Regional Research Hydrologist <br />U,S. Geological Survey, MS-472 <br />Water Resources Division <br />345 Middlefield Road <br />Menlo Park, CA 94025 <br /> <br />U,S, Geological Survey <br />Information Services <br />Box 25286 <br />Federal Center <br />Denver, CO 80225-0046 <br />