Columbia subject headings:
Voltaire, 1694-1778--Fictional works.
Voltaire, 1694-1778--Philosophy.
Harvard subject headings:
Allegory.
Philosophy in literature.
Voltaire, 1694-1778--Fictional works.
Princeton subject headings:
Voltaire, 1694-1778--Fictional works.
Voltaire, 1694-1778--Philosophy.