Columbia subject headings:
Dante Alighieri, 1265-1321--Symbolism.
Dante Alighieri, 1265-1321. Purgatorio.
Doors in literature.
Symbolism in literature.
Harvard subject headings:
Dante Alighieri, 1265-1321--Allegory and symbolism.
Dante Alighieri, 1265-1321. Purgatorio.
Doors in literature.
Symbolism in literature.
Princeton subject headings:
Dante Alighieri, 1265-1321--Allegory and symbolism.
Dante Alighieri, 1265-1321. Purgatorio.
Doors in literature.
Symbolism in literature.