Columbia subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.
Logic, Modern--17th century.
Logic.
Harvard subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Logic.
Logic, Modern--17th century.
Princeton subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716.
Logic.