Columbia subject headings:
Harvard subject headings:
Architecture, Modern--20th century--Congresses
City planning--History--20th century--Congresses.
Schumacher, Fritz, 1869-1947--Congresses.
Princeton subject headings:
Architecture, Modern--20th century--Congresses.
City planning--History--20th century--Congresses.
Schumacher, Fritz, 1869-1947--Congresses.