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<br />-;_ ~",.C: <br />te, <br />.....-' <br />N <br />N- <br />O <br />o <br /> <br />U.S, DEPAR1MENT OF TIlE INTERIOR <br /> <br />BRUCE BABBm. Secretary <br /> <br />U.S. GEOLOGICAL SURVEY <br /> <br />Dallas L. Peck, Director <br /> <br />,...,..,.' <br /> <br />ftuly me of trade, product, or firm names in this plblicatioD is for <br />descriptive purposes only aDd does not constitute endorsement by <br />the U.S. GOVcnm>eJ1t <br /> <br />For additional information <br />write 10: <br /> <br />District Chief <br />U.S, Geological Survey <br />333 W. Nye Lane, Room 203 <br />Carson City, NV 89706-0866 <br /> <br />Copies of this report may be <br />purchased from: <br /> <br />U.S. Geological Survey <br />Books and Open-File Reports Section <br />Federal Center <br />Box 25425 <br />Denver. CO 80225 <br />