Columbia subject headings:
Philosophy--History--18th century--Congresses.
Psychology--History--18th century--Congresses.
Wolff, Christian, Freiherr von, 1679-1754--Congresses.
Harvard subject headings:
Philosophy--18th century--Congresses.
Psychology--History--18th century--Congresses.
Wolff, Christian, Freiherr von, 1679-1754--Congresses.
Princeton subject headings: