International Economic Conference, Geneva, May 4th, 1927 : Documentation. The relation of labour cost to total costs of production in agriculture / League of Nations. The relation of labour cost to total costs of production in agriculture. League of Nations. International Labour Office International Economic Conference (1927 : Geneva, Switzerland) Agriculture Economic aspects. Agricultural laborers. 331.06 LEI Geneva : League of Nations, 1926. 1926. 1926 Text 66 p. ; eng