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Recovery Plan for Rock Gnome Lichen: (Gymnoderma lineare) (Evans) Yoshimura and Sharp. Prepared for U.S. Fish and Wildlife Service, 1997.
Memorandum from Keith R. Langdon to the Superintendent on Ramps. Great Smoky Mountain National Park, 1995.
The Smokies All Taxa Biodiversity Inventory: History and Progress." Southeastern Naturalist 6, no. sp2 (2007): 27-34.
"Seslids, or Clear-Wing Moths." ATBI Quarterly 2, no. 3 (2001): 12.
"Scientific Research and Collecting Permits in National Parks." ATBI Quarterly 2, no. 2 (2001): 8.
"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.
"Dragonflies and Damselflies of the Smokies." Southeastern Biology 53, no. 2 (2006): 180.
"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.
"Checklist of Odonata from Great Smoky Mountains National Park." Southeastern Naturalist 6, no. sp2 (2007): 207-214.
"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.
Wildflowers of the Smokies. Gatlingburg, TN: Great Smoky Mountains Natural History Association, 1996.