Columbia subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.
Logic.
Metaphysics.
Harvard subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Logic.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Metaphysics.
Logic.
Metaphysics
Princeton subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.
Logic.
Metaphysics.