Columbia subject headings:
Harvard subject headings:
John XXIII, Pope, 1881-1963.
World War, 1939-1945--Religious aspects--Catholic Church
Princeton subject headings:
Catholic Church--Foreign relations--Greece.
Catholic Church--Foreign relations--History--20th century.
Catholic Church--Foreign relations--Turkey.
Greece--Foreign relations--Catholic Church.
John XXIII, Pope, 1881-1963--Career in diplomacy.
Turkey--Foreign relations--Catholic Church.
World War, 1939-1945--Diplomatic history.