Columbia subject headings:
Harvard subject headings:
Germany--Intellectual life--19th century--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Princeton subject headings:
Festschriften.
Germany--Intellectual life--19th century--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Urbanization--Germany--Congresses.