Recognition of services of civilian officers and employees in construction of the Panama Canal : hearing before the Committee on Interstate Canals, United States Senate, Seventy-sixth Congress, first session, on S. 50, a bill to provide for recognizing the services rendered by civilian officers and employees in the construction and establishment of the Panama canal and the Canal Zone; and S. 1162, a bill to provide for the recognition of the services of the civilian officials and employees, citizens of the United States, engaged in and about the construction of the Panama Canal. March 7, 1939.