Columbia subject headings:
Harvard subject headings:
Germany--Foreign economic relations--Romania.
Petroleum industry and trade--Romania--History.
Romania--Foreign economic relations--Germany.
World War, 1939-1945--Fuel supplies--Germany.
Princeton subject headings:
Germany--Foreign economic relations--Romania.
Petroleum industry and trade--Romania--History.
Romania--Foreign economic relations--Germany.
World War, 1939-1945--Fuel supplies--Germany.