Copyright Office, the U.S. Patent and Trademark Office, and the Copyright Royalty Tribunal : oversight hearings before the Subcommittee on Courts, Civil Liberties, and the Administration of Justice of the Committee on the Judiciary, House of Representatives, Ninety-seventh Congress, first session, on Copyright Office, the U.S. Patent and Trademark Office and the Copyright Royalty Tribunal, March 4 and June 11, 1981.