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<br />u.s. DEPARTMENT OF THE INTERIOR <br /> <br />BRUCE BABBITT. Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Cordon P. Eaton. Director' <br /> <br /> <br />For additional information write to: <br /> <br />Chief. Branch of Regional Research. Western Region <br />U.S. Geological Survey <br />345 Middlefield Road. MS.47 2 <br /> <br />Menlo Park. CA 94025 <br /> <br />Copies of this report are available free from: <br /> <br />U.S. Geological Survey <br />Branch of Inforrnation Services <br />Box 25286 <br />Denver, CO 80225 <br />