Federal firearms legislation : hearings before the Subcommittee to Investigate Juvenile Delinquency of the Committee on the Judiciary, United States Senate, Ninetieth Congress, second session pursuant to S. Res. 240, Ninetieth Congress on S. 3691, a bill to amend Title 18, United States Code : S. 3604, a bill to require the registration of firearms : S. 3,634, a bill to disarm lawless persons : S. 3637, a bill to provide for the establishment of a national firearms registry, June 26, 27, 28, and July 8, 9, and 10, 1968.