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Humphries, George. Air Quality In Great Smoky Mountains National Park management folio. rev. ed. Great Smoky Mountains Association, 2006.
Humphries, George. North Carolina Wildflowers., 2000.
Humphries, George. North Carolina Reflections In North Carolina Little Books. Englewood, CO: Westcliffe Publishers, 1998.
Humphries, George, Harley E. Jolley, and Dan J. Pittillo. Along the Blue Ridge Parkway. Englewood, CO: Westcliffe Publishers, 1997.