§ 861. Mandatory safety standards for underground mines(a) Coverage; enforcement; review
(b) Purpose; initiation of studies and research
(Pub. L. 91–173, title III, § 301, Dec. 30, 1969, 83 Stat. 765; Pub. L. 95–164, title II, § 203, Nov. 9, 1977, 91 Stat. 1317.)
