Columbia subject headings:
Energy policy--United States.
Imports--United States.
National security--United States.
Petroleum industry and trade--Government policy--United States.
Petroleum industry and trade--United States.
Petroleum reserves--United States.
Harvard subject headings:
Energy conservation--United States
Energy policy--United States
Imports--United States
National security--United States
Petroleum industry and trade--Government policy--United States
Petroleum industry and trade--United States
Petroleum reserves--United States.
Princeton subject headings:
Energy policy--United States.
Imports--United States.
National security--United States.
Petroleum industry and trade--Government policy--United States.
Petroleum reserves--United States.