Columbia subject headings:
Christianity--Origin--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Tradition (Theology)--Congresses.
Harvard subject headings:
Catholic Church--History--Early and primitive church, c. 30-600--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Tradition (Theology)--Congresses.
Princeton subject headings:
Christianity--Origin--Congresses.
Church history--Primitive and early church, ca. 30-600--Congresses.
Tradition (Theology)--Congresses.