Columbia subject headings:
Light metals industry--Norway--History--20th century.
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Economic aspects.
World War, 1939-1945--Norway.
Harvard subject headings:
Princeton subject headings:
Light metals industry--Norway--History--20th century.
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Occupied territories.