An extended bibliography of cryptography would fill many pages and is therefore beyond the scope of this work, but it is hoped that the following short selected list will be found useful. Some of these works are out of print or otherwise unobtainable, but may, in some instances, be found in public libraries or in old bookstores. The Riverbank Publications may be consulted at The Library of Congress, Washington, D. C.
More or Less Elementary Works
Boyer, John Q. “The Cryptogram” in Real Puzzles by John Q. Boyer, Rufus T. Strohm and George H. Pryor, pp. 147-154. Baltimore, 1925. (Simple substitution ciphers only.)
Buranelli, Prosper, Margaret Petherbridge and F. Gregory Hartswick. The Cryptogram Book. New York, 1928. (Simple substitution ciphers only.)
Hitt, Parker (Colonel). The A B C of Secret Writing. New York, 1935.
Lysing, Henry, pseud. (John Leonard Nanovic). Secret Writing. New York, 1936.
—. The Cryptogram Book. New York, 1937.
Mansfield, Louis C. S. The Solution of Codes and Ciphers. London, 1936.
—. One Hundred Problems in Cipher. London, 1936.
Ohaver, M. E. Cryptogram Solving. Columbus, Ohio, 1933, (Simple substitution ciphers only.)