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