Columbia subject headings:
Architecture--Europe--History--20th century.
Architecture--Europe--History--21st century.
City planning--Europe--History--20th century.
City planning--Europe--History--21st century.
Harvard subject headings:
Architecture--Europe--History--20th century
Architecture--Europe--History--21st century.
City planning--Europe--History--20th century
City planning--Europe--History--21st century.
Princeton subject headings:
Architecture--Europe--History--20th century.
Architecture--Europe--History--21st century.
City planning--Europe--History--20th century.
City planning--Europe--History--21st century.