Columbia subject headings:
Balkan Peninsula--History--20th century.
World War, 1939-1945--Campaigns--Balkan Peninsula.
Harvard subject headings:
Balkan Peninsula--History--1918-1945.
Balkan Peninsula--History--20th century.
World War, 1939-1945--Campaigns--Balkan Peninsula.
Princeton subject headings:
Balkan Peninsula--History--20th century.
World War, 1939-1945--Campaigns--Balkan Peninsula.