Columbia subject headings:
Greece--Religion--Congresses.
Ritual--Greece--Congresses.
Ritual--Rome--Congresses.
Rome--Religion--Congresses.
Harvard subject headings:
Greece--Religion--Congresses.
Ritual--Greece--Congresses.
Ritual--Rome--Congresses.
Rome--Religion--Congresses.
Princeton subject headings:
Greece--Religion--Congresses.
Ritual--Greece--Congresses.
Ritual--Rome--Congresses.
Rome--Religion--Congresses.