Columbia subject headings:
Harvard subject headings:
Leopardi, Giacomo, 1798-1837--Criticism and interpretation.
Leopardi, Giacomo, 1798-1837--Knowledge--Nature.
Leopardi, Giacomo, 1798-1837--Knowledge--Philosophy.
Princeton subject headings:
Leopardi, Giacomo, 1798-1837--Criticism and interpretation.
Nature in literature.
Science in literature.