Title: Pennsylvania, Locks and Dams Nos. 1, 3, 4, and 5, Monongahela River. Letter from the Secretary of War, transmitting, with a letter from the Chief of Engineers, reports of examination of Locks and Dams Nos. 1, 3, 4, and 5, Monongahela River, Pennsylvania
Subjects: Reservoirs, Locks (Hydraulic engineering)
Places: Pennsylvania, Monongahela River (W. Va. and Pa.)