Columbia subject headings:
Mystical union.
Mysticism--Catholic Church--Early works to 1800.
Harvard subject headings:
Mysticism--Early works to 1800
Mysticism--History--Middle Ages, 600-1500
Mysticism--Netherlands.
Ruusbroec, Jan van, 1293-1381. Boecsken der verclaringhe.
Spiritual life--Christianity--Early works to 1800
Spiritual life--Christianity--Middle Ages, 600-1500.
Princeton subject headings:
Mystical union.
Mysticism--Catholic Church--Early works to 1800.