EconomicsWages and labor pamphletsKarl Marx, Eleanor Marx Aveling, William Green, Thomas Brassey 1st Earl Brassey, James Mavor, Tibor Szalai, William Denny, Henry Noel Brailsford, John Atkinson Hobson, Arthur Creech Jones, E. E. Wise, J. Augustin Leger, Leonard Porter Ayres, J. E. Crawford Munro, Robert Engels, Hans Bruno Guhl, William A. Wescott, Ernest Solvay, Arthur Webster Thompson, Basil Maxwell Manly, Lewis H. Haney, Frederick C. Waite, Federal Council of the Churches of Christ in America. Department of the Church and Social Service. Research Department, American Railway Association, United States. Interstate Commerce Commission. Bureau of Transport Economics and Statistics