Columbia subject headings:
Architecture--Competitions--Portugal--History--20th century.
Architecture--Competitions--Portugal--History--21st century.
Architecture--Portugal--History--20th century.
Architecture--Portugal--History--21st century.
Harvard subject headings:
Architecture--Competitions--Portugal--History--20th century.
Architecture--Competitions--Portugal--History--21st century.
Architecture--Portugal--History--20th century
Architecture--Portugal--History--21st century.
Princeton subject headings:
Architecture--Competitions--Portugal--History--20th century.
Architecture--Competitions--Portugal--History--21st century.
Architecture--Portugal--History--20th century.
Architecture--Portugal--History--21st century.