[19] Economics, 353.
[20] Political Economy, 381.
[21] Evolution of Modern Capitalism, 297.
[22] Wealth & Progress, 171.
[23] Report Industrial Commission, XIX, 926.
[24] Getting a Living, 475.
[25] Report Industrial Commission, XIX, 746.
[26] Ind. Com., Rep: XIX, 757.
[27] Bull. of U. S. Bur. of Lab., Sept., 1908, p. 418.
[28] Economics, 337.