1988—Subsec. (a). Pub. L. 100–301, § 7(1), designated existing provisions as subsec. (a), substituted “Except as provided in subsection (b), there” for “There”, and added subsec. (b).

1978—Pub. L. 95–625 increased land acquisition appropriations authorization to $156,700,000 from $116,000,000.