To America's best idea. Wish you were here to celebrate with us, John Prine, Emmylou Harris and 6,000 other celebrants at the Roosevelt Arch marking the North Entrance to Yellowstone National Park. America the beautiful, indeed.
...the Service thus established shall promote and regulate the use of the Federal areas known as national parks, monuments and reservations…by such means and measures as conform to the fundamental purpose of the said parks, monuments and reservations, which purpose is to conserve the scenery and the natural and historic objects and the wild life therein and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations.
AN ACT TO ESTABLISH A NATIONAL PARK SERVICE, AND FOR OTHER PURPOSES, Approved August 25, 1916 (39 Stat. 535)