United States. National Park Service. (1990). Restoration of Cumberland Gap and the Wilderness Road: Development concept plan, environmental assessment, interpretive prospectus : Cumberland Gap National Historical Park, Kentucky/Virginia/Tennessee : draft. U.S. Dept. of the Interior, National Park Service.
Chicago Style (17th ed.) CitationUnited States. National Park Service. Restoration of Cumberland Gap and the Wilderness Road: Development Concept Plan, Environmental Assessment, Interpretive Prospectus : Cumberland Gap National Historical Park, Kentucky/Virginia/Tennessee : Draft. [Washington, D.C.?]: U.S. Dept. of the Interior, National Park Service, 1990.
MLA (9th ed.) CitationUnited States. National Park Service. Restoration of Cumberland Gap and the Wilderness Road: Development Concept Plan, Environmental Assessment, Interpretive Prospectus : Cumberland Gap National Historical Park, Kentucky/Virginia/Tennessee : Draft. U.S. Dept. of the Interior, National Park Service, 1990.