00709cam a22001932  4500001001300000003000500013005001700018008004100035040001800076074000900094086002900103245011300132260003100245300002800276500004100304500004400345650004100389710008500430hsl000724815DGPO20170826152509.0100901s1949    dcu          f000 0 eng d  aGPOcGPOdMvI  a02850 aY 4.IN 8/4:R 13/48/SUPP.00aRailroad safety :bsupplemental hearings, 81st Congress, 1st session, on H.R. 378, H.R. 530, Aug. 4-9, 1949.  a[Washington, D.C.],c1949.  aiii, 203-332 p. :bill.  aDistribution made by issuing office.  aCRDP Program Historic Shelflist record. 0aRailroadsxSignalingzUnited States.1 aUnited States.bCongress.bHouse.bCommittee on Interstate and Foreign Commerce.