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U.S. Department of the Interior <br />KEN SALAZAR, Secretary <br />U.S. Geological Survey <br />Marcia K. McNutt, Director <br />For product and ordering information: <br />World Wide Web: http:llwww.usgs.gov /pubprod <br />Telephone: 1- 888 - ASK -USGS <br />For more information on the USGS —the Federal source for science about the Earth, <br />its natural and living resources, natural hazards, and the environment: <br />World Wide Web: http:tlwww.usgs.gov <br />Telephone: 1- 888 - ASK -USGS <br />Any use of trade, product, or firm names is for descriptive purposes only and does not imply <br />endorsement by the U.S. Government. <br />Although this report is in the public domain, permission must be secured from the individual <br />copyright owners to reproduce any copyrighted material contained within this report. <br />Hn <br />