Columbia subject headings:
Harvard subject headings:
Alexandria (Egypt)--Antiquities, Roman--Congresses.
Alexandria (Egypt)--Civilization--Congresses.
Alexandria (Egypt)--Commerce--History--Congresses.
Egypt--Commerce--History--To 1500--Congresses.
Egypt--History--Greco-Roman period, 332 B.C.-640 A.D.--Congresses.
Princeton subject headings:
Alexandria (Egypt)--Antiquities, Greek.
Alexandria (Egypt)--Antiquities, Roman.