Columbia subject headings:
Harvard subject headings:
Leopardi, Giacomo, 1798-1837.
Nietzsche, Friedrich Wilhelm, 1844-1900
Philosophy, Italian--19th century.
Princeton subject headings:
Cosmology--History.
Leopardi, Giacomo, 1798-1837--Influence.
Nietzsche, Friedrich Wilhelm, 1844-1900.
Philosophy, Modern--19th century.