00946cam a22002651 4500 l 31000097 DLC 20260227111533.0 800308s1931 sz a 000 0 eng c l 31000097 (OCoLC)6062544 U.S. Dept of Labor NBuU DLC premarc HD4813 .I4 ser. D, no. 20 International Labour Office. Principles and methods of wage determination in the coal-mining industry; an international survey. Geneva, 1931. 104 p. incl. tables, forms. 24 cm. Studies and reports, Series D, Wages and hours of work, no. 20 At head of title: International Labour Office. Annex I: "Comparison of average wages in European coal-miners, 1925, 1927 and 1929": p. [87]-93. Wages. Coal miners. Coal mines and mining. 36029 36029