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Scientific Report
Murdock, Nora A., and Keith R. Langdon. Recovery Plan for Rock Gnome Lichen: (Gymnoderma lineare) (Evans) Yoshimura and Sharp. Prepared for U.S. Fish and Wildlife Service, 1997.
Personal Communication
Langdon, Keith R.. Memorandum from Keith R. Langdon to the Superintendent on the Status of American Ginseng., 1990.
Langdon, Keith R.. Memorandum from Keith R. Langdon to the Superintendent on Ramps. Great Smoky Mountain National Park, 1995.
Journal Article
Nichols, Becky J., and Keith R. Langdon. "The Smokies All Taxa Biodiversity Inventory: History and Progress." Southeastern Naturalist 6, no. sp2 (2007): 27-34.
Langdon, Keith R.. "Seslids, or Clear-Wing Moths." ATBI Quarterly 2, no. 3 (2001): 12.
Langdon, Keith R.. "Scientific Research and Collecting Permits in National Parks." ATBI Quarterly 2, no. 2 (2001): 8.
Dourson, Daniel C., and Keith R. Langdon. "Land Snails of Selected Rare High Elevation Forests and Heath Balds of the Great Smoky Mountains National Park." Journal of North Carolina Academy of Science 128, no. 2 (2012): 27-32.
Langdon, Keith R.. "Dragonflies and Damselflies of the Smokies." Southeastern Biology 53, no. 2 (2006): 180.
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.
Muise, Charles, Keith R. Langdon, Rebecca P. Shiflett, David Trently, Audrey Hoff, Paul E. Super, Adriean J. Mayor, and Becky J. Nichols. "Checklist of Odonata from Great Smoky Mountains National Park." Southeastern Naturalist 6, no. sp2 (2007): 207-214.
Conference Proceedings
Parker, Charles R., Keith R. Langdon, James R. Carter, Stephen C. Nodvin, and Hope Barett. Natural Resource Management and Research in Great Smoky Mountains National Park In Second International Symposium on Advanced Technology in Natural Resources Management. Washington, DC, 1990.
Book
White, Peter S., Tom Condon, Janet H. Rock, Carol Ann McCormick, Pat Beaty, and Keith R. Langdon. Wildflowers of the Smokies. Gatlingburg, TN: Great Smoky Mountains Natural History Association, 1996.
White, Peter S., Tom Condon, Janet H. Rock, Carol Ann McCormick, Pat Beaty, and Keith R. Langdon. Wildflowers of the Smokies. 2nd ed. Great Smoky Mountains Association.