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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. Page ii NATIONAL ACADEMY PRESS 2101 Constitution Avenue, NW Washington, D.C. 20418 NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council and by competent members of the Chinese Academy of Sciences and the Indian National Science Academy. 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 Grant No. 95-31825A-POP/PCE and 96-41812A-WER between the National Academy of Sciences and John D. and Catherine T. MacArthur Foundation and Task Order #34, NO1-OD-4139 of the Department of Health and Human Services. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project. International Standard Book Number 0-309-07554-8 Library of Congress Catalog Card Number 2001117395 Additional copies of this report are available from National Academy Press , 2101 Constitution Avenue, N.W. , Lockbox 285, Washington, D.C. 20055 ; (800) 624-6242 or (202) 334-3313 (in the Washington metropolitan area); Internet, http://www.nap.edu Cover Art: Photograph by Anamaria Viveros Printed in the United States of America Copyright 2001 by the National Academy of Sciences . All rights reserved.
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