To Amend the Copyright Act: Hearings Before a Subcommittee of the Committee on Patents, United States Senate, Sixty-eighth Congress, First Session, on S. 2600, a Bill to Amend Section 1 of an Act Entitled "An Act to Amend and Consolidate the Acts Respecting Copyright", Approved March 4, 1909; April 9, 17, and 18, 1924