The USGS publishes several items which may be helpful when searching for information about a particular county. The USGS publishes numerous maps each year. These are located in the map cabinet in the documents area. They are shelved alphabetically by quadrangle name. These maps show elevation, water resources, roads, and buildings.
Hydrologic maps are another USGS publication.
These, obviously, deal solely with water resources. One of these is compiled for each state. A geologic map of the state of Tennessee is kept in the Documents office, as is a geologic atlas that contains information for some of the surrounding counties. These give information pertaining to the geologic formation of the state. A useful tool for searching for maps is the Guide to Geologic and Hydrologic Maps which is shelved in the Documents Reference area.