A treatise on the art of decyphering, and of writing in cypher.
Subtitle: With an harmonic alphabet.
Contributors: George Fabyan Collection (Library of Congress)
Publisher: W. Brown
Published: 1772
Place of publication: London
Language: eng
Number of pages: 112
Subjects: Cryptography.; Ciphers.
Notes: Imperfect: plate 1 wanting.
Dedication signed: Philip Thicknesse.