Columbia subject headings:
Architecture, Modern--20th century--Congresses.
Architecture, Modern--21st century--Congresses.
City planning--Congresses.
Harvard subject headings:
Architecture, Modern--20th century--Congresses
Architecture, Modern--21st century
Architecture, Modern--21st century--Congresses.
City planning
City planning--Congresses
Princeton subject headings:
Architecture, Modern--20th century.
Architecture, Modern--21st century.
City planning.