Petroleum. Amend act to promote mining of coal, phosphate, oil, etc., report to accompany S. 3311 [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, 226) as amended, relating to oil and gas]; submitted by Mr. Greever.