[Maps of the environs of forts Franklin, Alexander, and Ripley, in Montgomery County, Maryland].
Four fort vicinity sketch maps, each covering the same area, but in various stages of completion. The map with the most detail includes roads, drainage, vegetation, and fortifications. Relief shown by contours on some maps. Forts Franklin, Alexander, and Ripley were part of the defenses of Washington. Title from published Civil War bibliography. Manuscript: pen-and-ink (black, brown), blue watercolor, lead pencil. At upper left...
United States. Army. Corps of Engineers