CipherUse as a topical subdivision under names of individual persons. See also what's at Wikipedia, your library, or elsewhere.
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Filed under: Bacon, Francis, 1561-1626 -- Cipher Bacon's Secret Disclosed in Contemporary Books (London: Gay and Hancock, 1911), by Granville C. Cuningham (multiple formats at archive.org) The Biliteral Cipher: Hints for Deciphering (London: R. Banks and Son, ca. 1890), by Mrs. Henry Pott (page images at HathiTrust) The Bacon-Shakspere Question Answered (second edition; London: Trubner and Co., 1889), by C. C. Stopes (page images at HathiTrust) Fundamental Principles of the Baconian Ciphers, and Application to Books of the Sixteenth and Seventeenth Centuries (typescript version; c1916), by George Fabyan Fundamental Principles of the Baconian Ciphers and Application to Books of the Sixteenth and Seventeenth Centuries (ca. 50-page printed version; c1916), by George Fabyan The Great Cryptogram: Francis Bacon's Cipher in the So-Called Shakespeare Plays (Chicago et al.: R. S. Peale and Co., 1888), by Ignatius Donnelly Lessons in the Greatest Work of Sir Francis Bacon of Verulam, Viscount St Alban (expanded version of his "Fundamental Principles of the Baconian Ciphers..."; c1916), by George Fabyan The Little Cryptogram: A Literal Application to the Play of Hamlet of the Cipher System of Mr. Ignatius Donnelly (Saint Paul: Pioneer Press Co., 1888), by Joseph Gilpin Pyle The Mystery of Francis Bacon (London: R. Banks and Son, 1912), by William T. Smedley (Gutenberg text and illustrated HTML) Secret Shakespearean Seals: Revelations of Rosicrucian Arcana, Discoveries in the Shakespeare Plays, Sonnets, and Works, Printed Circa 1586-1740, of "Secreti Sigilli", Concealed Author's Marks and Signs (Nottingham: H. Jenkins, 1916), by Fratres Roseae Crucis
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