Columbia subject headings:
Harvard subject headings:
Germany--Economic conditions--1918-1945.
Germany--Economic policy--1933-1945.
Oil industries--Government policy--Germany--History--20th century.
Oil industries--Government policy--Russia (Federation)--Volgograd.
Princeton subject headings:
Petroleum industry and trade--Germany--History--20th century.
World War, 1939-1945--Economic aspects--Germany.
World War, 1939-1945--Fuel supplies--Germany.
World War, 1939-1945--Political aspects--Germany.