Digital U.S. Geological maps are available at the USGS site.
For viewing the printed version, the Library owns the U.S. Geologic Service topographic map series for South Carolina, North Carolina and Georgia. They are located just past the compact shelving on the north side of Duke Library's main floor.
Search the catalog for Author: Geological Survey, and any state as Keyword.
The maps contained within the U.S. Serial Set represent one of the greatest single collections of cartographic materials of the United States. From the exploration of the American West to the Parisian defenses during the Crimean War, the Serial Set carto-bibliographic records allow unprecedented access to the 62,000+ maps of the Serial Set.
Go to Advanced Search. Clear all boxes and select "Serial Set Maps".