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<br />UNITED STATES DEPARTMENT DF THE INTERIOR <br /> <br />JAMES G. WATT, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />Dallas L. Peck, Director <br /> <br />For additional information <br />write to: <br /> <br />For sale by: <br /> <br />Colorado District Chief <br />U.S. Geological Survey, MS 415 <br />Box 25046, Denver Federal Center <br />Lakewood, CO 80225 <br /> <br />Open-File Services Section <br />Western Distribution Branch <br />U.S. Geological Survey, MS 306 <br />Box 25425, Denver Federal Center <br />Denver, CO 80225 <br />(303) 234-5888 <br />