Section was formerly classified to section 18d of Title 16, Conservation.

1975—Pub. L. 94–55 substituted provisions authorizing appropriations not to exceed $2,500,000 for fiscal year ending June 30, 1976, $625,000 for the transition period of July 1, 1976 through Sept. 30, 1976, $2,500,000 for fiscal year ending Sept. 30, 1977, and $2,500,000 for fiscal year ending Sept. 30, 1978, for provisions authorizing appropriations not to exceed $250,000 for fiscal year 1971 and $750,000 for fiscal year 1972.

1970—Pub. L. 91–549 substituted provisions authorizing appropriations of not more than $250,000 for fiscal year 1971 and not more than $750,000 for fiscal year 1972, for provisions which authorized appropriations of not more than $100,000 annually.