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History and prehistory in the National Park System and the National Historic Landmarks Program.

APA Citation

United States. National Park Service. History Division. (1987). History and prehistory in the National Park System and the National Historic Landmarks Program. Washington, D. C.: History Division, National Park Service .

MLA Citation

United States. National Park Service. History Division. History And Prehistory In the National Park System And the National Historic Landmarks Program. Washington, D. C.: History Division, National Park Service , 1987.

Warning: These citations may not always be complete (especially for serials).