PREFACE XI and for his permission to draw on unpublished material from his dissertation (Cambridge University, 1955) for Sections 3.4 and 4.5. We deeply appreci- ate the thoughtful kindness of Professor S. Schwarz and the Central Library of the Slovakian Academy of Sciences for sending us (unsolicited) a photo- stat print of Suschkewitsch's book. Our thanks go also to Mrs. Anna L. McGinity for typing all of Volume 1. Finally, the authors gratefully acknow- ledge partial support for this work from the National Science Foundation (U.S.A.). A. H. C. G. B. P. July 28, 1960 T H E TULANE UNIVERSITY OF LOUISIANA TH E ROYAL MILITARY COLLEGE OF SCIENCE
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