Columbia subject headings:
Civilization, Modern--Congresses.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Congresses.
Harvard subject headings:
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Congresses.
Philosophy, German--Congresses.
Philosophy, Modern--Congresses.
Princeton subject headings:
Civilization, Modern--Congresses.
Leibniz, Gottfried Wilhelm, Freiherr von, 1646-1716--Congresses.