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Solving simple substitution ciphers.

APA Citation

Harris, F. A., American Cryptogram Association. (1943). Solving simple substitution ciphers. [Rochester, N.Y.]: The American cryptogram association.

MLA Citation

Harris, Frances A, and American Cryptogram Association. Solving Simple Substitution Ciphers. [Rochester, N.Y.]: The American cryptogram association, 1943.

Warning: These citations may not always be complete (especially for serials).