Columbia subject headings:
Harvard subject headings:
Cartography--Europe--History--20th century.
Europe--Historical geography--Maps.
World War, 1914-1918--Cartography.
World War, 1914-1918--Maps
World War, 1939-1945--Cartography.
World War, 1939-1945--Maps.
Princeton subject headings:
Cartography--Europe--History--20th century.
Europe--Historical geography--Maps.
World War, 1914-1918--Cartography.
World War, 1914-1918--Maps.
World War, 1939-1945--Cartography.
World War, 1939-1945--Maps.