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Cover Design: Henry F. Mayland <br />Copyright ©1989 by the American Society of Agronomy, Inc. <br />Soil Science Society of America, Inc. <br />ALL RIGHTS RESERVED UNDER THE U.S. COPYRIGHT LAW <br />OF 1978 (P.L. 94-553) <br />Any and all uses beyond the limitations of the "fair use" provision <br />of the law require written permission from the publisher(s) and/or the <br />author(s); not applicable to contributions prepared by officers or <br />employees of the U.S. Government as part of their official duties. <br />Second Printing 1990 <br />American Society of Agronomy, Inc. <br />Soil Science Society of America, Inc. <br />677 South Segoe Road, Madison, WI 53711, USA <br />Library of Congress Cataloging-in-Publication Data <br />Selenium in agriculture and the environment. <br />(SSSA special publication; no. 23) <br />Bibliography: p. <br />1. Selenium in agriculture-Congresses. 2. Selenium-Environ- <br />mental aspects-Congresses. I. Jacobs, L.W. II. American Society of <br />Agronomy Division A-5. III. American Society of Agronomy. Divi- <br />sion S-2. IV. American Society of Agronomy. Division S-4. V. Soil <br />Science Society of America. VI. Series. <br />5587.S.S4S45 1989 630'.2'46724 89-6301 <br />ISBN 0-89118-789-8 <br />Printed in the United States of America <br />