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The Case of the Wild Onions: The Impact of Ramps on Cherokee Rights." Southern Cultures 18, no. 2 (2012): 104-117.
"Population Recovery Following Differential Harvesting of Allium tricoccum Ait. in the Southern Appalachians." Biological Conservation 116 (2004): 227-234.
"The Impacts of Ramp Harvesting." Discovering the Smokies 1, no. 1 (1997): 10-11.
"The Impact of Harvesting Ramps (Allium Tricoccum Ait.) In Great Smoky Mountains National Park. Gatlinburg, TN: National Park Service, 1996.
Memorandum from Keith R. Langdon to the Superintendent on Ramps. Great Smoky Mountain National Park, 1995.
Abstracts of the Nineteenth Annual Scientific Research Meeting In Annual Scientific Research Meeting-National Park Service, Southeast Region. Gatlingburg, TN: U.S. Department of the Interior, National Park Service, 1994.