Columbia subject headings:
Architecture, Roman--Spain--Congresses.
City planning--Spain--History--Congresses.
Urbanization--Spain--History--Congresses.
Harvard subject headings:
Architecture, Roman--Spain--Congresses.
City planning--Spain--History--Congresses.
Urbanization--Spain--History--Congresses.
Princeton subject headings:
Architecture, Roman--Spain--Congresses.
City planning--Spain--History--Congresses.
Urbanization--Spain--History--Congresses.