1. A congressional history of railways in the United States to 1850 / by Lewis Henry Haney, Assistant Professor of Economics, University of Iowa. Haney, Lewis H. (Lewis Henry), 1882-1969 Madison, Wisconsin : [publisher not identified], 1908. Book Online
2. Emergencies in railroad work / by L.F. Loree, M. Am. Soc. C. E., special university lecturer. Loree, Leonor Fresnel, 1858-1940 Madison, Wis. : The University, 1895. Book Online