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"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.
"Checklist of Odonata from Great Smoky Mountains National Park." Southeastern Naturalist 6, no. sp2 (2007): 207-214.
"The Smokies All Taxa Biodiversity Inventory: History and Progress." Southeastern Naturalist 6, no. sp2 (2007): 27-34.
"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.
Recovery Plan for Rock Gnome Lichen: (Gymnoderma lineare) (Evans) Yoshimura and Sharp. Prepared for U.S. Fish and Wildlife Service, 1997.
Wildflowers of the Smokies. Gatlingburg, TN: Great Smoky Mountains Natural History Association, 1996.
Memorandum from Keith R. Langdon to the Superintendent on Ramps. Great Smoky Mountain National Park, 1995.
"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.
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.
Wildflowers of the Smokies. 2nd ed. Great Smoky Mountains Association.
