00812cam a22002531 4500 l 51000030 DLC 20260227111542.0 800220s1951 sw 000 0 eng l 51000030 (OCoLC)6004120 DLC NBuU DLC premarc TN803 .I73 International Labour Office Productivity in coal mines. Third item on the adgenda. Geneva n.p. 1951 vi, 177 p. 24 cm. At head of title: Report 3. International Labour Organisation. Coal Mines Committee. 4th session, Geneva, 1951 Coal mines and mining. Coal miners. Labor productivity. International Labour Organisation. Coal Mines Committee. 36727 36727