NATIONAL ACADEMY PRESS 2101 Constitution Avenue, NW 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 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.
This study was supported by Contract/Grant No. 98-G-203 between the National Academy of Sciences and the Forest Service of the U.S. Department of Agriculture. 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 organizations or agencies that provided support for the project.
International Standard Book Number 0-309-08456-3
Additional copies of this report are available from National Academy Press , 2101 Constitution Avenue, N.W. , Lockbox 285, Washington, D.C. 20055 ; (800) 624–6242 or (202) 334–3313 (in the Washington metropolitan area); Internet, http://www.nap.edu
Printed in the United States of America
Copyright 2002 by the National Academy of Sciences. All rights reserved.