Public [act] 213-297½ 298-346, 74th Congress. Petroleum. S. 3311, act 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].

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