Columbia subject headings:
Energy industries--Europe, Eastern--Periodicals.
Energy industries--Soviet Union--Periodicals.
Petroleum industry and trade--Europe, Eastern--Periodicals.
Petroleum industry and trade--Soviet Union--Periodicals.
Harvard subject headings:
Energy industries--Europe, Eastern--Periodicals.
Energy industries--Soviet Union--Periodicals.
Petroleum industry and trade--Europe, Eastern--Periodicals.
Petroleum industry and trade--Soviet Union--Periodicals.
Princeton subject headings:
Energy industries--Europe, Eastern--Periodicals.
Energy industries--Soviet Union--Periodicals.
Petroleum industry and trade--Europe, Eastern--Periodicals.
Petroleum industry and trade--Soviet Union--Periodicals.