Columbia subject headings:
Amphitheaters--Spain--Tarragona.
Aqueducts--Spain--Segovia.
Inscriptions, Latin--Spain.
Romans--Spain.
Spain--Antiquities, Roman.
Harvard subject headings:
Aqueducts--Spain--Segovia.
Inscriptions, Latin--Spain.
Roman Circus (Tarragona, Spain)
Princeton subject headings: