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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 competencies and with regard for appropriate balance.

This report has been reviewed by individuals chosen for their diverse perspectives and technical expertise, in accordance with procedures approved by the NRC's Report Review Committee. The purpose of this independent review is to provide candid and critical comments that will assist the authors and the NRC in making the published report as sound as possible and to ensure that the report meets institutional standards for objectivity, evidence, and responsiveness to the study charge. The content of the review comments and draft manuscript remain confidential to protect the integrity of the deliberative process. We wish to thank the following individuals for their participation in the review of this report:

David Bernstein, Stanford University

John A. Daly, Consultant

Gerald Dinneen, National Academy of Engineering

Harold Forsen, National Academy of Engineering

Irving Lerch, American Physical Society

Bruce L. R. Smith, Brookings Institution

While the individuals listed above have provided many constructive comments and suggestions, responsibility for the final content of this report rests solely with the authoring committee and the NRC.

International Standard Book Number: 0-309-06042-7

Library of Congress Catalog Card Number: 98-84557

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Copyright 1998 by the National Academy of Sciences. All rights reserved.

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