1976—
Pub. L. 94–455, title XIX, § 1901(b)(22)(A), Oct. 4, 1976,
90 Stat. 1798, struck out item 632 “Sale of oil or gas properties”.
1964—
Pub. L. 88–272, title II, § 227(b)(2), Feb. 26, 1964,
78 Stat. 98, inserted reference to domestic iron ore in item 631.