NATIONAL ACADEMY PRESS
2101 Constitution Ave., N.W.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, 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 project was supported by Contract No. 68-W4-0044 between the National Academy of Sciences and the U.S. Environmental Protection Agency and by endowment funds of the National Academy of Sciences. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the U.S. Environmental Protection Agency.

International Standard Book Number 0-309-07127-5

Additional copies of this report are available from: National Academy Press
2101 Constitution Ave., NWBox 285Washington, DC 20055
800-624-6242 202-334-3313 (in the Washington metropolitan area) http://www.nap.edu

Copyright 2000 by the National Academy of Sciences. All rights reserved.

Printed in the United States of America



The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement