Portal-to-portal wages. Hearings before a subcommittee of the Committee on the Judiciary, United States Senate, Eightieth Congress, first session, on S. 70, a bill to exempt employers from liability for portal-to-portal wages in certain cases, and for other purposes. January 15, 16, 17, 18, 20, 21, 22, 23, 25, 27, and 30, 1947 (1947)