Investigation of concentration of economic power. Part 14, Petroleum industry: section 1, September 25, 26, 27, 28, 29, and 30, 1939 : hearings before the Temporary National Economic Committee, Congress of the United States, Seventy-sixth Congress, second session pursuant to Public Resolution no. 113 (Seventy-fifth Congress), authorizing and directing a select committee to make a full and complete study and investigation with respect to the concentration of economic power in, and financial control over, production of goods and services