Smokies Collections include Department of Conservation Photographs, 1939-1976, Paul Jay Adams Papers, 1918-1962 (plus addition 1 and addition 1a), Tennessee Postcards, Tennessee Great Smoky Mountains National Park Commission, 1927-1937, and Albert F. Ganier Photographic Collection, 1900-1955. Look under tab for Library and Archives to find the link to the catalog.
Smokies collections include Edward P. Moses Papers, 1901-1948, George Erwin Gullett Stephens Papers, 1884-1988, North Carolina County Photograph Collection, and George Myers Stephens Papers, 1924-1979.
NARA which holds the archives for the federal government has extensive collections related to the formation of the Great Smoky Mountains National Park. You can search the archives through the catalog or go directly to Record Group 79 (National Park Service). Some archives for the GSMNP are held at regional branches of the National Archives. For example, Southeast region holds the district court records (record group 21) for GSMNP land condemnation cases. Access and information for all NARA holdings is through the central NARA website.