Columbia subject headings:
Language and languages.
Leopardi, Giacomo, 1798-1837--Knowledge and learning.
Leopardi, Giacomo, 1798-1837--Philosophy.
Harvard subject headings:
Leopardi, Giacomo, 1798-1837--Knowledge--Language and languages.
Leopardi, Giacomo, 1798-1837--Philosophy.
Princeton subject headings:
Leopardi, Giacomo, 1798-1837--Knowledge--Language and languages.
Leopardi, Giacomo, 1798-1837--Philosophy.