1992—Pub. L. 102–488 inserted at end “For fiscal years after fiscal year 1991, there is authorized to be appropriated an additional $15,000,000 for development and an additional $7,300,000 for acquisition of lands and interests in lands.”

1970—Pub. L. 91–548 substituted “$13,900,000” for “$8,000,000” and “$10,900,000” for “$5,000,000”.