Actions for Cotton and Grain Futures Act : hearings before the Committee on Agriculture and Forestry, United States Senate, Seventy-first Congress, Third session, on S. 3420, a bill to amend and reenact the act of August 11, 1916, known as the United States Cotton Futures Act, S. 4129, a bill to prevent the sale of cotton and grain in future markets, and S. 5542, a bill to amend the Grain Futures Act, February 10 and 11, 1931