Columbia subject headings:
Harvard subject headings:
Europe--Antiquities, Roman--Congresses.
Mithraism--Europe--Congresses.
Mithraism--Rome--Congresses.
Rome--Antiquities--Congresses.
Princeton subject headings:
Europe--Antiquities, Roman--Congresses.
Mithraism--Europe--Congresses.
Mithraism--Rome--Congresses.
Rome--Antiquities--Congresses.