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Marion, Jeffrey L.. Developing a Natural Resource Inventory and Monitoring Program for Visitor Impacts on Recreation Sites: A Procedural Manual In Natural Resources Report. Denver, CO: National Park Service, 1991.
Marion, Jeffrey L., and Yu-Fai Leung. An Assessment of Campsite Conditions in Great Smoky Mountains National Park In Research/Resources Management Report. U. S. Department of the Interior, National Park Service , 1997.