To amend section 21 of the Mineral Leasing Act of 1920 : hearings before the Subcommittee on Mines and Mining of the Committee on Interior and Insular Affairs, House of Representatives, Ninety seventh Congress, first session, on H.R. 1409, H.R. 2844, and H.R. 2897 ... hearings held : Vernal, Utah, May 29, 1981, Washington, D.C., June 25, 1981.

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