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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. THE NATIONAL ACADEMIES 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. Support for this project was provided by the Department of Homeland Security under Purchase Order Number 248836. Any views expressed in this publication are those of the workshop participants and do not necessarily reflect the views of the agency that provided support for the project. International Standard Book Number 0-309-09236-1 (POD) International Standard Book Number 0-309-53272-8 (PDF Full Book) Available from the Copyright 2004 by the National Academy of Sciences. All rights reserved. Printed in the United States of America
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