Columbia subject headings:
Harvard subject headings:
Great Britain. Special Operations Executive--History.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Secret service--Greece.
Princeton subject headings:
Great Britain. Special Operations Executive--History.
Greece--History--Occupation, 1941-1944.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Secret service--Greece.