History of the Labor Movement in the United States (4 vols./ 4 Bände) - Vol.I: From Colonial Times to the Founding of The American Federation of Labour/ Vol.II: From the Founding of the A.F. of L. to the Emergence of American Imperialism/ Vol.III: The Policies and Practices of the American Federation of Labor 1900-1909/ Vol.IV: The Industrial Workers of the World 1905-1917