Columbia subject headings:
Heresy--History--To 1500.
Hermetism--History--To 1500.
Philosophy, Medieval--History.
Platonists--History--To 1500.
Harvard subject headings:
Christian heresies--History--Middle Ages, 600-1500
Hermetism--History.
Philosophy, Medieval.
Platonists.
Princeton subject headings:
Heresy--History--To 1500.
Hermetism--History--To 1500.
Philosophy, Medieval--History.
Platonists--History--To 1500.