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<br />District Chief <br />U,S, Geologicai Survey <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br />Denver, CO 80225-0046 <br /> <br />U,S, Geological Survey <br />I nformation Services <br />Box 25286 <br />Denver Federal Center <br />Denver, CO 80225 <br /> <br /> <br />- - '" "b " () <br />\" .i..J, <br /> <br />U,S, DEPARTMENT OF THE INTERIOR <br />GALE A. NORTON, 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 />