Columbia subject headings:
Geothermal resources--Southern States.
Lignite--Southern States.
Power resources--Southern States.
Uranium.
Harvard subject headings:
Geothermal resources--Southern States.
Geothermal resources.
Lignite--Southern States.
Lignite.
Power resources
Power resources--Southern States.
Uranium.
Princeton subject headings:
Geothermal resources--Southern States.
Lignite--Southern States.
Power resources--Southern States.
Uranium.