Columbia subject headings:
Trendelenburg, Friedrich Adolf, 1802-1872--Congresses.
Harvard subject headings:
Philosophers--Germany--19th century--Congresses.
Trendelenburg, Friedrich Adolf, 1802-1872--Congresses.
Princeton subject headings:
Philosophers--Germany--19th century--Congresses.
Trendelenburg, Friedrich Adolf, 1802-1872--Congresses.