Columbia subject headings:
Harvard subject headings:
France--History--1914-1940.
Norway--History--1905-1940.
World War, 1939-1945--Campaigns--France.
World War, 1939-1945--Campaigns--Norway.
World War, 1939-1945--Causes.
Princeton subject headings:
France--History--1914-1940.
Norway--History--1905-1940.
World War, 1939-1945--Campaigns--France.
World War, 1939-1945--Campaigns--Norway.
World War, 1939-1945--Causes.