Liability of employers. : Hearings before the Committee on Interstate Commerce of the United States Senate, having under consideration the bills (H.R. 239, S. 156, and S. 1657) relating to liability of common carriers by railroads in the District of Columbia and territories and common carriers by railroads engaged in commerce between the states and between the states and foreign nations to their employees / May 3 to 8, 1906. Fifty-ninth Congress, first session.