Columbia subject headings:
Feuerbach, Ludwig, 1804-1872--Congresses.
Philosophy--History--Congresses.
Harvard subject headings:
Feuerbach, Ludwig, 1804-1872--Congresses.
Philosophy--History--Congresses.
Princeton subject headings:
Feuerbach, Ludwig, 1804-1872--Congresses.
Philosophy--History--Congresses.