Columbia subject headings:
Industrial districts--Europe--History--Congresses.
Industrial location--Europe--History--Congresses.
Harvard subject headings:
Industrial districts--Europe--History--Congresses.
Industrial location--Europe--History--Congresses.
Industries--Europe--History--Congresses.
Princeton subject headings:
Industrial districts--Europe--History--Congresses.
Industrial location--Europe--History--Congresses.
Industries--Europe--History--Congresses.