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D. VAN NOSTRAND COMPANY, INC.

120 Alexander St., Princeton, New Jersey
257 Fourth Avenue, New York 10, New York
25 Hollinger Rd., Toronto 16, Canada
Macmillan & Co., Ltd., St. Martin’s St., London, W.C. 2, England

All correspondence should be addressed to the principal office of the company at Princeton, N. J.

Copyright, ©, 1956 by
D. VAN NOSTRAND COMPANY, INC.

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Published simultaneously in Canada by D. VAN NOSTRAND COMPANY (Canada), LTD.

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All Rights Reserved
This book, or any parts thereof, may not be reproduced in any form without written permission from the author and the publishers.

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Library of Congress Catalogue Card No.: 56-9010

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PRINTED IN THE UNITED STATES OF AMERICA