This subchapter, referred to in subsec. (a), was in the original “this subtitle”, meaning subtitle J (§§ 1550–1554) of title XV of Puspan. L. 97–98, Dec. 22, 1981, 95 Stat. 1344, which enacted this subchapter and section 2273 of Title 7, Agriculture, and amended section 1236 of Title 30, Mineral Lands and Mining. For complete classification of subtitle J to the Code, see Tables.