50th Anniversary National Park Service Block of Stamps

"Old Faithful" YELLOWSTONE NATIONAL PARK WYOMING NATIONAL PARK SERVICE Art Craft Department FIRST DAY OF ISSUE 50 ÄNNIVERSARY NATIONAL PARK SERVICE THE NATIONAL PARK SYSTEM IS DEDICATED CONSERVING THE SCENIC, SCIENTIFIC, AND HISTORIC HERITAGE OF THE U.S. FOR THE BENEFIT AND ENJOYMENT OF ITS PEOPLE STONE NATIONAL aks National Park Service 1916-1966 1966 5⁰ 5⁰ A A PARK National Park Service 1916-1966 Ceccacce FIRST DAY OF ISSUE National Park Service 1916-1966 National 8332 Park Service 1916-1966 Judson 5 Lindsey 43147. Nelson Dr-Perica del 5⁰ U.S.