Title: We never sleep : the first fifty years of the Pinkertons /
Authors: Voss, Frederick.; Barber, James, 1952-; National Portrait Gallery (Smithsonian Institution)
Publisher: Published for the National Portrait Gallery by the Smithsonian Institution Press : For sale by the Supt. of Docs., U.S.G.P.O.,
Year: 1981
Subjects: Pinkerton, Allan, Exhibitions.; Pinkerton's National Detective Agency History Exhibitions.; Detectives United States Biography Exhibitions.; Private investigators United States Biography Exhibitions.