Overview of Civil War Codes and Ciphers
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What's What: Civil War Spy Codes - Bellairsia
Decoding Diplomacy « The Junto
SCARD- CRYPTOGRAPHY HOME PAGE
Civil War Cipher Disks
Codes, Ciphers and Secret Writing – tenyps
Civil War at the National Cryptologic Museum on Virmuze
An Innovative Technology of War (U.S. National Park Service)
Woods, Ciphers, and Stones
Top Secret: the Stager ciphers in the Civil War
John Wilkes Booth's “Confederate” Cipher
History of Cryptography and Cryptanalysis: Codes, Ciphers, and Their Algorithms
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