Petroleum. Amending oil and gas leasing act of 1920, report to accompany H. R. 5530 [to amend act to promote mining of coal, phosphate, oil, oil shale, gas, and sodium on public domain (41 Stat. 437, U. S. C., title 30, sees. 185, 221, 223, and 226), as amended, relating to oil and gas]; submitted by Mr. Greever.