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For additional information <br />write to: <br />District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Federal Center <br />Denver, CO 80225 -0046 <br />Copies of this report can <br />be purchased from: <br />U.S. Geological Survey <br />Books and Open -File Reports Section <br />Federal Center <br />Box 25425 <br />Denver, CO 80225 -0425 <br />