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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.
Civil War Home
Home of the American Civil War: Elizabeth Van Lew
A biography of the eccentric Union spy, Elizabeth Van Lew, also known as "Crazy Bet" from "Spies for the Blue and Gray" by Harnett T. Kane.
Duke University
Special Collections Library: Rose O;neal Greenhow Papers
A fascinating look at the documents concerning Rose O'Neal Greenhow. Included are letters she wrote from prison.
Duke University
Duke University: Special Collections Library: Rose O'neal Greenhow
This article is about Rose Greenhow, her life, and the important roles women played in the war.
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.