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Central Intelligence Agency
Cia: Intelligence in the Civil War [Pdf]
A multi-topic look at intelligence gathering, the tools used, and the people involved in both the North and the South during the Civil War. Comprehensive, interesting coverage from the CIA.
Other
Signal Corps Association: Espionage in the Civil War
Read about the murky underground stories of espionage on both sides of the Civil War. The spies were often eccentric, and the raiders ruthless.