C. Economic Conflict Groups

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(2) ——. The History of Trade Unionism. (Revised edition extended to 1920.) New York and London, 1920.

(3) Commons, John R., editor. Trade Unionism and Labor Problems, Boston, 1905.

(4) ——. History of Labor in the United States. 2 vols. New York, 1918.

(5) Groat, George G. An Introduction to the Study of Organized Labor in America. New York, 1916.

(6) Hoxie, Robert F. Trade Unionism in the United States. New York, 1917.

(7) Marot, Helen. American Labor Unions. By a member. New York, 1914.

(8) Carlton, Frank T. Organized Labor in American History. New York, 1920.

(9) Levine, Louis. Syndicalism in France. 2d rev. ed. of The Labor Movement in France. New York and London, 1914.