Petroleum investigation, index to pts. 1-4 of hearing before subcommittee. 76th Congress, 3d session, on H. Res. 290 and H. R. 7372, to promote conservation of petroleum, to provide for cooperation with States in preventing waste of petroleum, to create Office of Petroleum Conservation, to amend act of Feb. 22, 1935, as amended, and for other purposes, June 20, 1940; [prepared in Mines Bureau by H. M. Thome, W. H. Barlow, and Peter Grandone].

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