Section, with the exception of the last sentence, was from section 4 of act Jan. 26, 1915.

The last sentence was from section 1 of act June 12, 1917.

1919—Act Mar. 1, 1919, ch. 88, struck out “Provided, That no appropriation for the maintenance, supervision, or improvement of said park in excess of $10,000 annually shall be made unless the same shall have first been expressly authorized by law” after “automobiles therein:”.

Pub. L. 108–7, div. F, title I, § 140, Feb. 20, 2003, 117 Stat. 244, provided that: “In fiscal year 2003 and each fiscal year thereafter, notwithstanding any other provision of law, with respect to a service contract for the provision solely of transportation services at Zion National Park or Rocky Mountain National Park, the Secretary of the Interior may obligate the expenditure of fees expected to be received in that fiscal year before the fees are received, so long as total obligations do not exceed fee collections retained at Zion National Park or Rocky Mountain National Park, respectively, by the end of that fiscal year.”

Pub. L. 104–333, div. I, title VIII, § 810, Nov. 12, 1996, 110 Stat. 4189, provided that: “The Secretary of the Interior is authorized to collect and expend donated funds and expend appropriated funds for the operation and maintenance of a visitor center to be constructed for visitors to and administration of Rocky Mountain National Park with private funds on privately owned lands located outside the boundary of the park.”