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