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<br /><1--3'\4 <br />. ... ~... <br /> <br />.. <br /> <br />U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br /> <br />U.S, GEOLOGICAL SURVEY <br /> <br />Gordon p, Eaton. 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 />District Chief <br />U,S. Geological Survey <br />Box 25046. Mail Stop 415 <br />Denver Federal Center <br />Denver, CO 80225-0046 <br /> <br />U,S, Geological Survey <br />Branch of Information Services <br />Box 25286 <br />Denver, CO 8022-0286 <br />