Columbia subject headings:
Harvard subject headings:
Rome--Antiquities--Congresses.
Toledo (Spain)--Antiquities--Congresses.
Water resources development--Spain--Toledo--History--Congresses.
Water-supply engineering--Spain--Toledo--History--Congresses.
Water-supply--Rome--History--Congresses.
Water-supply--Spain--Toledo--History--Congresses.
Water-supply--Spain--Toledo--Management--History--Congresses.
Princeton subject headings:
Archaeology, Medieval--Spain--Toledo--Congresses.
Excavations (Archaeology)--Spain--Toledo--Congresses.
Hydrology--Spain--Toledo--History--To 1500--Congresses.
Islamic antiquities--Spain--Toledo--Congresses.
Toledo (Spain)--Antiquities--Congresses.
Water-supply engineering--Spain--Toledo--History--To 1500--Congresses.
Water-supply--Spain--Toledo--History--To 1500--Congresses.