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U.S. Department of the Interior <br />Gale A. Norton, Secretary <br />U.S. Geological Survey <br />Charles G. Groat, Director <br />U.S. Geological Survey, Reston, Virginia: 2003 <br />For sale by U.S. Geological Survey, Information Services <br />Box 25286, Denver Federal Center <br />Denver, CO 80225 <br />For more information about the USGS and its products: <br />Telephone: 1-888-ASK-USGS <br />World Wide Web: http://www.usgs.gov/ <br />Any use of trade, product, or firm names in this publication is for descriptive purposes only and does not imply <br />endorsement by the U.S. Government.