Columbia subject headings:
Rome--Religion.
Harvard subject headings:
Italy--Religion--Congresses.
Italy--Religious life and customs--Congresses.
Rome--Religion--Congresses.
Rome--Religion.
Rome--Religious life and customs--Congresses.
Princeton subject headings:
Italy--Religion--Congresses.
Italy--Religious life and customs--Congresses.
Rome--Religion--Congresses.
Rome--Religious life and customs--Congresses.