Infringements of copyrights. : Hearing before the Subcommittee on Patents, Trademarks, and Copyrights of the Committee on the Judiciary, United States Senate, Eighty-sixth Congress, second session, on H.R. 4059, to amend title 28 of the United States code relating to actions for infringements of copyrights by the United States. June 2, 1960. (U.S. Govt. Print. Off,, 1960)