Railroad safety :  supplemental hearings, 81st Congress, 1st session, on H.R. 378, H.R. 530, Aug. 4-9, 1949. 

 - [Washington, D.C.],  1949. 
 - iii, 203-332 p. :  ill. 
<br/><br/> Distribution made by issuing office.  CRDP Program Historic Shelflist record. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Railroads--Signaling--United States.
<br/><br/><label>GPO Item No.: </label>0285 
<br/><br/><label>Gov. Doc. Class. No.: </label>Y 4.IN 8/4:R 13/48/SUPP.