Lobby investigation. Part 10, May 6, 8, 9, 13, 20-23, 27, 28, June 3, 4, 5, 11, and 12, 1930 : hearings before a subcommittee of the Committee on the Judiciary, United States Senate, Seventy-first Congress, second session pursuant to S. Res. 20, a resolution to investigate the activities of lobbying associations and lobbyists in and around Washington, District of Columbia