The Shakespearean ciphers examined : an analysis of crypthographic systems used as evidence that some author other than William Shakespeare wrote the plays commonly attributed to him / by William F. Friedman & Elizabeth S. Friedman
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Copy note: Authors' presentation copy to G.E. Mellen, March 18, 1958. Letter (typescript, signed) and envelope from F. Ronald Mansbridge (manager, Cambridge University Press) to Gregory E. Mellen, March 17, 1958, laid in. Letter (typescript, signed) and envelope from William F. Friedman and Elizebeth Smith Friedman to Gregory E. Mellen, March 20, 1958, laid in.