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MY WARMEST thanks and the dedication of this book to Major D. D. Millikin, O.R.C., who has made one of the finest collections in existence of works dealing with ciphers, and who has been most generous in allowing me to consult them, beside helping to locate other sources. Thanks are also due to Dr. E. H. Sutherland for permission to quote from his THE PROFESSIONAL THIEF and to Mr. Waldemar Kaempffert, for permission to use his material with regard to Dr. Hans Gross.

A good bibliography on the subject of ciphers and codes can be found in Major Millikin’s article on the subject in the ENCYCLOPEDIA AMERICANA. The only work now in print in English touching on the subject is THE MILITARY CIPHER OF COMMANDANT BAZERIES by Rosario Candela. (Cardanus Press, New York, 1938.) The American Cryptogram Association has announced for publication a textbook on cryptography, ELEMENTARY CRYPTANALYSIS (The American Photographic Publishing Company, Boston).