Columbia subject headings:
Dupré i Raventós, Xavier.
Excavations (Archaeology)--Spain--Congresses.
Sewerage--Rome--Congresses.
Sewerage--Rome.
Sewerage--Spain--History--Congresses.
Sewerage--Spain--History.
Spain--Antiquities, Roman--Congresses.
Spain--Antiquities, Roman.
Harvard subject headings:
Dupré i Raventós, Xavier.
Sewerage--Rome--Congresses.
Sewerage--Rome.
Sewerage--Spain--History--Congresses.
Sewerage--Spain--History.
Spain--Antiquities, Roman--Congresses.
Princeton subject headings: