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Journal Article
Watson, J. K., Paris L. Lambdin, and Keith R. Langdon. "Diversity of Scale Insects (Homoptera: Coccoidea) in the Great Smoky Mountains National Park." Annals of the Entomological Society of America 87, no. 2 (1994): 225-230.
Langdon, Keith R.. "Dragonflies and Damselflies of the Smokies." Southeastern Biology 53, no. 2 (2006): 180.