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Langdon, Keith R.. "Dragonflies and Damselflies of the Smokies." Southeastern Biology 53, no. 2 (2006): 180.
Langdon, Keith R.. "Scientific Research and Collecting Permits in National Parks." ATBI Quarterly 2, no. 2 (2001): 8.
Langdon, Keith R.. "Seslids, or Clear-Wing Moths." ATBI Quarterly 2, no. 3 (2001): 12.
Langdon, Keith R.. Memorandum from Keith R. Langdon to the Superintendent on Ramps. Great Smoky Mountain National Park, 1995.
Langdon, Keith R.. Memorandum from Keith R. Langdon to the Superintendent on the Status of American Ginseng., 1990.