Columbia subject headings:
Harvard subject headings:
Christianity and culture--Iran--History--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Iran--Church history--Congresses.
Sassanids--History--Congresses.
Princeton subject headings:
Christianity--Iran--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Sassanids--Congresses.