Columbia subject headings:
Coal--Carbonization--Germany.
Coke industry--Military aspects--Germany.
World War, 1939-1945--Germany--Aerial operations, American.
Harvard subject headings:
Coal--Germany--Carbonization.
Coke industry--Germany.
Coke industry--Military aspects--Germany.
War damage, Industrial--Germany.
World War, 1939-1945--Economic aspects--Germany.
World War, 1939-1945--Germany--Aerial operations, American.
Princeton subject headings:
Coke.
World War, 1939-1945--Aerial operations.
World War, 1939-1945--Germany.