[Instructions on the use of ciphers and codes]
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Gilder Lehrman Collection #: GLC01404.02 Author/Creator: Place Written: s.l. Type: Manuscript document Date: 1860-1870 Pagination: 2 p. : Height: 26.2 cm, Width: 20.7 cm Order a Copy
Discusses ciphers and the numerous ways their messages may be concealed. Date estimated from other items in the group. In a collection with a letter by James Longstreet to John G. Walker.
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