The railroad problem ; a collection of papers on various aspects of the railroad problem and presenting many points of view and contending suggestions concerning its solution / reprinted from the publications of the Academy of political science in the city of New York; the Proceedings of the academy, vol. 8, no. 4, January, 1920; vol. 10, no. 1, July, 1922; the Political science quarterly, vol. 36, no. 3, September, 1921.