Columbia subject headings:
Energy policy--Soviet Union.
Gas industry--Government policy--Soviet Union.
Petroleum industry and trade--Government policy--Soviet Union.
Harvard subject headings:
Energy policy--Soviet Union
Gas industry--Government policy--Soviet Union.
Petroleum industry and trade--Government policy--Soviet Union.
Princeton subject headings:
Energy policy--Soviet Union.
Gas industry--Government policy--Soviet Union.
Petroleum industry and trade--Government policy--Soviet Union.