Eight-hour laws: public law 193, 52d Congress, 1st session; public law 28 (extract), 59th Congress, 1st session; public law 381 (extract), 59th Congress, 2d session; public law 479 (extract), 61st Congress, 3d session; public law 199, 62d Congress, 2d session; public law 336 (extract), 62d Congress, 2d session; public law 290 (extract), 62d Congress, 2d session; public law 408, 62d Congress, 3d session; public law 60, 63d Congress, 2d session; public law 68, 64th Congress, 1st session; public law 252, 64th Congress, 1st session.