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