U.S. Geological Survey

<body> <img src="../images/usgsteal.gif" WIDTH="100" HEIGHT="100" alt="USGS"> <h2>Welcome to the U.S. Geological Survey's Web Site</h2> <hr> <h3>Our page uses HTML frames, which your browser does not support. </h3> <p> Please use our <a href="titlpage.htm">text version.</a> <p> </h3> <address>For additional information <a href="mailto:jduval@usgs.gov">send e-mail to the author of this Open-File Report</a><br> at jduval@usgs.gov. </address> <p> <hr> <em>This page last updated 10/10/2001</em> </body>