Columbia subject headings:
Gnostic literature--Congresses.
Nag Hammadi codices--Congresses.
Harvard subject headings:
Gnostic literature--History and criticism--Congresses.
Nag Hammadi codices--Congresses.
Princeton subject headings:
Gnostic literature--Congresses.
Gnosticism--Congresses.
Nag Hammadi codices--Congresses.