1861 Alexandria Canal This is a crop of; Boschke, A, D McClelland, Hugh B Sweeny, Thos Blagden, and Blanchard & Mohun D. Mcclelland. Topographical map of the District of Columbia. Washington: D. McClelland, Blanchard & Mohun, 1861. Map. https://www.loc.gov/item/88694013/. Share this:FacebookXLike this:Like Loading...