00633cam a22001692  4500001001300000003000500013005001700018008004100035040001800076086002300094245012900117260003100246300001600277500004400293650004100337710008500378hsl000724802DGPO20170826152509.0100901s1949    dcu          f000 0 eng d  aGPOcGPOdMvI0 aY 4.IN 8/4:R 13/4800aRailroad safety :bhearings before subcommittee, 81st Congress, 1st session, on H.R. 378 and H.R. 530, May 17-June 24, 1949.  a[Washington, D.C.],c1949.  aiii, 202 p.  aCRDP Program Historic Shelflist record. 0aRailroadsxSignalingzUnited States.1 aUnited States.bCongress.bHouse.bCommittee on Interstate and Foreign Commerce.