Columbia subject headings:
Harvard subject headings:
Kant, Immanuel, 1724-1804
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716
Philosophy, German--18th century.
Princeton subject headings:
Kant, Immanuel, 1724-1804.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.