"Proceedings of meeting of coal operators of West Virginia and other states, January 8, 1908, Washington, D. C."; "Coal mines and mining--West Virginia.", "Coal mines and mining--United States.", "Mine safety--West Virginia.", "Mine safety--United States."; "1908"; "

Pamphlet.

"; ""; "P18792"; "pec"; "Coal mines and mining--United States.", "Mine safety--West Virginia.", "Mine safety--United States.", "Coal mines and mining--West Virginia."; "14256"; .