Plant Patent : hearings before the United States Senate Committee on the Judiciary, Subcommittee on Patents, Trademarks, and Copyrights, Eighty-Sixth Congress, first session, pursuant to S. Res. 53 on S. 1447 to amend Section 161, Title 35, United States Code, with respect to patents for plants [held] on July 9, 1959. (United States Government Printing Office, 1959)