Columbia subject headings:
Harvard subject headings:
Greece--Boundaries--History--Sources.
Greece--Foreign relations--History--Sources.
Greece--History--19th century--Sources.
Greece--History--20th century--Sources.
Princeton subject headings:
Greece--Boundaries--History--Sources.
Greece--Foreign relations--History--Sources.
Greece--History--19th century--Sources.
Greece--History--20th century--Sources.