Columbia subject headings:
Harvard subject headings:
Cities and towns--Europe--History--Congresses
Cities and towns--North America--History--Congresses.
Industrialization--Europe--History--Congresses.
Industrialization--History--Congresses.
Industrialization--North America--History--Congresses.
Princeton subject headings:
Cities and towns--Congresses.
Industrialization--Congresses.
Sociology, Urban--Congresses.