United States. National Park Service. Preservation Assistance Division. (1989). Preservation tech notes. National Park Service, Preservation Assistance Division.
Citación estilo ChicagoUnited States. National Park Service. Preservation Assistance Division. Preservation Tech Notes. Washington, D.C.: National Park Service, Preservation Assistance Division, 1989.
Cita MLAUnited States. National Park Service. Preservation Assistance Division. Preservation Tech Notes. National Park Service, Preservation Assistance Division, 1989.
Warning: These citations may not always be 100% accurate.