Railroads. Investigation of railroads, holding companies, and affiliated companies, hearings before subcommittee, 77th Congress, 2d session, pursuant to S. Res. 71 (74th Congress), authorizing investigation of interstate railroads and affiliates with respect to financing, reorganizations, mergers, and certain other matters: Protective committees and associations related to railroads, Missouri Pacific, Chicago & North Western, Security Owners Association, conference of shippers and investors, etc.