Columbia subject headings:
Harvard subject headings:
Cities and towns--History--To 1500--Congresses.
Cultural pluralism--Congresses
Emigration and immigration--History--To 1500--Congresses.
Princeton subject headings:
Cities and towns--History--To 1500--Congresses.
Cultural pluralism--Congresses.
Emigration and immigration--History--To 1500--Congresses.