Columbia subject headings:
Gnosticism--Congresses.
Manichaeism--Congresses.
Nag Hammadi codices--Congresses.
Harvard subject headings:
Gnosticism--Congresses
Manichaeism--Congresses.
Nag Hammadi codices--Congresses.
Princeton subject headings:
Gnosticism--Congresses.
Manichaeism--Congresses.
Nag Hammadi codices--Congresses.