Petroleum. Conservation of oil and gas and protection of American sources thereof from injury, hearing, 72d Congress, 1st session, on H. R. 10863, for conservation of oil and gas and protection of American sources thereof from injury, correlation of domestic and foreign production, and consenting to interstate compact for such purposes, also copy of H. R. 12076 introduced as substitute for H. R. 10863, May 14, 1932.