United States. National Park Service. Preservation Assistance Division. (1989). Preservation tech notes. National Park Service, Preservation Assistance Division.
Citace podle Chicago (17th ed.)United States. National Park Service. Preservation Assistance Division. Preservation Tech Notes. Washington, D.C.: National Park Service, Preservation Assistance Division, 1989.
Citace podle MLA (8th ed.)United States. National Park Service. Preservation Assistance Division. Preservation Tech Notes. National Park Service, Preservation Assistance Division, 1989.
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