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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the opinions or policies of the U.S. Government. Mention of trade names or commercial products does not constitute their endorsement by the U.S. Government. Supported by the U.S. Geological Survey, Department of the Interior, under assistance Award No. 01HQAG0193. International Standard Book Number (ISBN) 0-309-08489-X Additional copies of this report are available from: Board on Earth Sciences and Resources National Research Council 500 Fifth Street, N.W. Washington, DC 20001 202–334–2744 http://www.nationalacademies.org/besr Copyright 2002 by the National Academy of Sciences. All rights reserved. Printed in the United States of America.
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