Columbia subject headings:
Architecture--Germany--Berlin--History--20th century.
Architecture--Germany--Berlin.
Berlin (Germany)--Buildings, structures, etc.
City planning--Germany--Berlin--History--20th century.
Harvard subject headings:
Architecture, Modern--20th century--Congresses
Cities and towns--Congresses
City planning--Congresses
Princeton subject headings:
Architecture, Modern--20th century--Congresses.
Cities and towns--Congresses.
City planning--Congresses.