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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.

This study was supported by the U.S. Geological Survey under contract No. G10AC00538. The opinions, findings, and conclusions or recommendations contained in this document are those of the authors and do not necessarily reflect the views of the sponsor.

International Standard Book Number-13: 978-0-309-22449-9
International Standard Book Number-10: 0-309-22449-7
ISBN 0-309-22449-7

Additional copies of this report are available from the National Academies Press, 500 Fifth Street, NW, Keck 360, Washington, DC 20001; (800) 624-6242 or (202) 334-3313, www.nap.edu.

Cover: The cover shows several examples of global scientific research conducted by the USGS and a complementary domestic science issue that the global research helps to inform. Design by Anne Rogers.

Copyright 2012 by the National Academy of Sciences. All rights reserved.

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