1988—Pub. L. 100–541 designated existing provisions as subsec. (a), substituted “sums” for “sums, but not more than $1,800,000 in all,”, and added subsec. (b).

1978—Pub. L. 95–625 increased development appropriations authorization to $24,715,000 from $10,362,000 and prohibited expenditure of funds for improvements incompatible with wilderness management within the corridor of the park leading to the summit of Guadalupe Peak.