Columbia subject headings:
Private revelations--Early works to 1800.
Purgatory--Early works to 1800.
Revelation of Purgatory.
Visions--Early works to 1800.
Harvard subject headings:
Private revelations--Early works to 1800.
Purgatory--Early works to 1800
Revelation of Purgatory.
Visions--Early works to 1800
Princeton subject headings:
Private revelations--Early works to 1800.
Purgatory--Early works to 1800.
Revelation of purgatory.
Visions--Early works to 1800.