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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. THE NATIONAL ACADEMIES PRESS 500 Fifth Street, N.W. Washington, DC 20001 NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Academies, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. This material is based upon work supported by the National Science Foundation through Grant No. 0632843 and the United Engineering Foundation. Any opinions, findings and conclusions or recommendations expressed in this publication are those of the authors and do not necessary reflect the view of the organizations or agencies that provided support for the project. International Standard Book Number 13: 978-0-309-14831-3 International Standard Book Number 10: 0-309-14831-6 Copies of this report are available from the National Academies Press, 500 Fifth Street, N.W., Lockbox 285, Washington, DC 20055; (888) 624-8373 or (202) 334-3313 (in the Washington metropolitan area); online at http://www.nap.edu. Copyright 2010 by the National Academy of Sciences. All rights reserved. Printed in the United States of America
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