Columbia subject headings:
Harvard subject headings:
Liberty--Congresses
Politics and literature--Congresses.
Romanticism--Congresses
Romanticism--Germany--Congresses
Romanticism--Political aspects--Congresses.
Princeton subject headings:
Liberty--Congresses.
Politics and literature--Congresses.
Romanticism--Congresses.
Romanticism--Germany--Congresses.
Romanticism--Political aspects--Congresses.