Section 4 of the Federal Coal Leasing Amendments Act of 1975 (90 Stat. 1085), referred to in subsec. (e), is section 4 of Pub. L. 94–377, Aug. 4, 1976, 90 Stat. 1085, redesignated the Federal Coal Leasing Amendments Act of 1976, which amended section 201(b) of this title.