Columbia subject headings:
Visions--Early works to 1800.
Visions--History of doctrines--Middle Ages, 600-1500.
Harvard subject headings:
Visions--Early works to 1800
Visions--History of doctrines--Middle Ages, 600-1500.
Princeton subject headings:
Visions--Early works to 1800.
Visions--History of doctrines--Middle Ages, 600-1500.