Title: Tunnels, nitro, and convicts
Subjects: Convict labor, Nitroglycerin, Western North Carolina Railroad Company. Mountain Division, Railroad tunnels, History, Railroads, Western North Carolina Railroad Company, Design and construction, Railroads, united states, history, Tunnels, North carolina, history
Places: McDowell County, North Carolina, McDowell County (N.C.)
Time periods: 19th century