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<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 /> <br />~ <br /> <br />e-I <br />el <br />e'l <br />e,: <br />e: <br />r <br />e. <br />r <br /> <br />~ :1 <br />e <br />e' <br />el <br />el <br />Do !. <br />~ II <br />et <br />e' <br />e <br />e <br />l <br />e! <br />-e .1 <br />e,;. <br />e: <br />e" <br />e'J <br />e :1 <br />e <br />e. <br />e <br />e <br />e <br />e, <br />e <br />e <br />e <br />e <br />e <br />e <br />e. <br />e' <br />el <br />e <br /> <br />oan32 <br /> <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 />~ <br />