1985—Subsec. (a). Pub. L. 99–198 substituted “1990” for “1985”.

1981—Subsec. (a). Pub. L. 97–98, § 1110(1), (2), substituted “1985” for “1981” and “If a special program is implemented” for “Under the special program”.

Subsec. (d). Pub. L. 97–98, § 1110(3), inserted “, reduced acreage, or land diversion”.

Amendment by Pub. L. 97–98 effective Dec. 22, 1981, see section 1801 of Pub. L. 97–98, set out as an Effective Date note under section 4301 of this title.

Section effective Oct. 1, 1977, see section 1901 of Pub. L. 95–113, set out as an Effective Date of 1977 Amendment note under section 1307 of this title.