1992—Subsec. (b). Pub. L. 102–573 amended subsec. (b) generally. Prior to amendment, subsec. (b) read as follows: “There are authorized to be appropriated for each of the fiscal years 1989, 1990, 1991, and 1992, $300,000 to carry out the provisions of this section.”

1988—Pub. L. 100–690 struck out “, not later than 120 days after October 27, 1986,” after “the Interior shall”, designated existing provisions as subsec. (a), and added subsec. (b).