National Park Service statistical abstract - Public Use Statistics Program Center (U.S.); United States. National Park Service.; United States. National Park Service.; United States. National Park Service.; United States. National Park Service. Public Use Statistics Office.; United States. National Park Service. Socio-Economic Studies Division.; United States. National Park Service. Statistical Office. (Denver, Colo, Statistical Office, U.S. Dept. of the Interior, National Park Service, 1989-, 2003)
https://www.biodiversitylibrary.org/bibliography/64884
Keywords: National parks and reserves|Periodicals|Public use|Statistics|United States|