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<br />OJ 'J ' :J' <br />I 't-'t <br /> <br />U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Mark Schaefer, Acting 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 />Information Services <br />Box 25286 <br />Federal Center <br />Denver, CO 80225 <br />