Columbia subject headings:
Harvard subject headings:
Cities and towns, Ancient--Gaul--Congresses.
Cities and towns, Ancient--Spain--Congresses.
Country life--Gaul--History--Congresses.
Country life--Spain--History--Congresses.
Gaul--Rural conditions--Congresses.
Romans--France--Congresses
Romans--Spain--Congresses
Spain--Rural conditions--Congresses.
Princeton subject headings:
Cities and towns, Ancient--Gaul--Congresses.
Country life--Gaul--History--Congresses.
Country life--Spain--History--Congresses.
Romans--France--Congresses.
Romans--Spain--Congresses.