Hours of work in coal mines : report iv : fouth item on the agenda - Coal Mines Committee 1949 : Pittsburg); International Labour Organization (Geneva); International Labour Organization (Geneva) . Coal Mines Committee (Geneva : International Labour Office, 1949)
At head of title : Report 4. International Labour Organisation. Coal Mines Committee, 3d sess., Pittsburg, Apr. 1949
Keywords: Coal mines and mining; Coal miners; Hours of labor