Title Thirty years of labor, 1859-1889 [microform] : in which the history of the attempts to form organizations of workingmen for the discussion of political, social, and economic questions is traced ; the National Labor Union of 1866, the Induatrial Brotherhood of 1874, and the order of the Knights of Labor of America and the world ; the chief and most important principles in the preamble of the Knights of Labor discussed and explained with views of the author on land, labor and transportation.