Columbia subject headings:
Patra (Greece)--Antiquities, Roman--Congresses.
Patra (Greece)--History--Congresses.
Romans--Greece--Patra--Congresses.
Harvard subject headings:
Princeton subject headings:
Patra (Greece)--Antiquities, Roman--Congresses.
Patra (Greece)--History--Congresses.
Romans--Greece--Patrai--Congresses.