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Library of Congress Catalog Card Number 61-14940 



With 37 illustrations and 31 tables 



ALL RIGHTS RESERVED. 

 THIS BOOK OR ANY PART THEREOF MAY NOT BE REPRODUCED IN 

 ANY FORM (INCLUDING PHOTOSTATIC OR MICROFILM FORM) 

 WITHOUT WRITTEN PERMISSION FROM THE PUBLISHERS. 



PRINTED IN THE NETHERLANDS BY 

 A. SIJTHOFF, THE HAGUE 



