Columbia subject headings:
Portugal--Colonies--Africa--History--20th century.
Portugal--Relations--Sao Tome and Principe.
Sao Tome and Principe--Relations--Portugal.
Harvard subject headings:
Princeton subject headings:
Portugal--Colonies--Africa--History--20th century.
Portugal--Foreign relations--Sao Tome and Principe.
Sao Tome and Principe--Foreign relations--Portugal.
Sao Tome and Principe--History--20th century.
Sao Tome and Principe--Politics and government.