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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. NATIONAL ACADEMY PRESS 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 report has been reviewed by a group other than the authors according to procedures approved by a report review committee consisting of members of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The project was supported by the U.S. Environmental Protection Agency under contract no. 68D50054. Library of Congress Catalog Card No. 96-69352 International Standard Book No. 0-309-05545-8 Additional copies of this report are available from: Copyright 1996 by the National Academy of Sciences. All rights reserved. Printed in the United States of America First Printing, June 1996 Second Printing, May 1997
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