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.

Support for this project was provided by the Department of Energy (under Grant No. DE-FG-02-92ER61514); the Environmental Protection Agency (under Contract No. 68D10096); the National Aeronautics and Space Administration (under Contract No. W88958); the National Institute of Standards and Technology (under Contract No. 50SBNB3C7500); and the National Oceanic and Atmospheric Administration (through Grant No. INT-9118880). Although the results described in this document have been funded in part by the United States Environmental Protection Agency under the Assistance Agreement to the National Academy of Sciences, the document has not been subjected to the Agency's peer and administrative review and therefore may not necessarily reflect the views of the Agency, and no official endorsement should be inferred. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the sponsoring agencies.

Library of Congress Catalog Card Number 95-67403

International Standard Book Number 0-309-05082-0

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Copyright 1995 by the National Academy of Sciences. All rights reserved.

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