Recording of Federal oil leases : hearing before the Subcommittee on Public Lands of the Committee on Interior and Insular Affairs, United States Senate, Eighty-seventh Congress, second session, on S. 413, a bill to amend the Mineral leasing act of 1920 in order to provide for public records of oil and gas leases issued under such act and other instruments affecting title of such leases, and for other purposes. March 14, 1962.