Image: Sketch of the Defenses of Pittsburg (sic) made by order of Captain Craighill, Corps of Engrs., USA, July 20th, 1863... - NARA - 305785 (cropped, showing Fort Black)
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Title: Sketch of the Defenses of Pittsburg [sic] made by order of Captain Craighill, Corps of Engrs., USA, July 20th, 1863 By B. W. O'Grady
Credit: U.S. National Archives and Records Administration
Author: Unknown authorUnknown author or not provided
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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