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<br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />WILLIAM P. CLARK, Secretary <br />GEOLOGICAL SURVEY <br /> <br />Dallas L. Peck, Director <br /> <br />"'.. ('".,." <br /> <br />For additional information write to: <br /> <br />Colorado District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br />Lakewood, CO 80225 <br /> <br />May be purchased from: <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) 236-7476 <br />