At head of title: U.S. Coast Survey. Prof. A. D. Bache, Supt. Stamped in lower right corner: From collection of David Dixon Porter. Pen and ink manuscript drawn on tracing cloth, covering the environs of forts More
Includes note describing positions of Union "mortar flotilla" on April 18-21, 1862. Annotated in pencil on verso: Forts of Jackson/St. Philip, [1863?]. "The Forts from data furnished by the Chief Engineer, U.S. More