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<br />, <br /> <br />U. S. DEPARTMENT OF THE INTERIOR <br /> <br />BRUCE BABBITT. Secretary' <br /> <br /> <br />U.S. GEOLOGICAL SURVEY <br />Dallas L. Peck, Director <br /> <br />First printing 1993 <br />Second printing 1993 <br /> <br />UNITED STATES GOVERNMENT PRINTING OFFICE: 1993 <br /> <br />Free on application to the Books and Open-File Reports Sales, <br />U.S. Geological Survey, Federal Center, Box 25286, Denver, CO 80225 <br /> <br />~_.~ <br />