Kane, Harnett T. Spies for the Blue and Gray - [1st ed.] - Hanover House Garden City, N.Y. 1954 [1954] - 311 p.22 cm. Subjects--Topical Terms: Spies -- United States.United States -- History -- Civil War, 1861-1865 -- Secret service.--E LC Class. No.: E608.K3