Columbia subject headings:
Bridges, Roman--Spain--Valladolid (Province)
Roads, Roman--Spain--Valladolid (Province)
Valladolid (Spain : Province)--Antiquities, Roman.
Harvard subject headings:
Bridges, Roman--Spain--Valladolid (Province)
Roads, Roman--Spain--Valladolid (Province)
Valladolid (Spain : Province)--Antiquities, Roman.
Princeton subject headings: