Columbia subject headings:
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Campaigns--Norway.
Harvard subject headings:
Norway--History--German occupation, 1940-1945.
World War, 1939-1945--Campaigns--Norway.
Princeton subject headings:
Norway--History--German occupation, 1940-1945.
Railroads--Norway--History--20th century.
World War, 1939-1945--Campaigns--Norway.
World War, 1939-1945--Transportation.