50th Anniversary National Park Service

National Park Service 1916-1966 FIRST DAY OF ISSUE NATIONAL 25 1966 FIRST DAY OF ISSUE 83020 NATIONAL PARK SERVICE "OldDaithful YELLOWSTONE NATIONAL PARK WYOMING eerier NNIVERSARY NATIONAL PARK SERVICE THE NATIONAL PARK SYSTEM IS DEDICATED TO Arf Craft CONSERVING THE SCENIC, SCIENTIFIC, AND HISTORIC HERITAGE OF THE U.S. FOR THE BENEFIT AND ENJOYMENT OF ITS PEOPLE PARK.WY OLSHOTO STONE