Readings in trade unionism : labor organization, principles and problems, as discussed by trade unionists in their official publications and writings / by David J. Saposs, with the collaboration of Bertha Tigay Saposs. Saposs, David J. (David Joseph), 1886-1968. Saposs, Bertha Tigay. Labor unions United States. Working class United States. 331.881 SAR "Who's who": p. 445-449. "List of labor publications": p. 450-451. New York : Macmillan, 1927 1927 1927 Text xxv, 451 p. : eng [The Workers' bookshelf] Workers' bookshelf. United States. United States.