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<br />,t" ~,.", (' :,~ <br /> <br />UNITED STATES DEPARTMENT OF THE INTERIOR <br /> <br />JAMES G. WATT, Secretary <br /> <br />GEOLOGICAL SURVEY <br /> <br />Doyle G. Frederick, Acting Director <br /> <br />, <br /> <br />~~(rJ~n\r;v,- i <br />. MAY221981 ~ <br />L.... <br /> <br />LULl<, ." ",' <br />CQ,NSt:BYAIION SOMQ <br /> <br />", <br /> <br />For additional information <br />write to: <br /> <br />For sale by: <br /> <br />District Chief <br />U.S. Geological Survey <br />Box 25046, Mail Stop 415 <br />Denver Federal Center <br />Lakewood, CO 80225 <br /> <br />Open-File Services Section <br />Branch of Distribution <br />U.S. Geological Survey, MS 306 <br />Box 25425, Denver Federal Center <br />Denver, CO 80225 <br />(303) 234-5888 <br />