en.wikipedia.org
en.wikipedia.org
britannica.com
en.wikipedia.org
worldatlas.com
nps.gov
National Park Service
https://www.nps.gov › grsm › index.htm
nationalgeographic.com
factmonster.com
britannica.com
pbs.org
national-parks.org
The Global Alliance of National Parks
https://national-parks.org › united-states › great-smoky-mountains
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