Columbia subject headings:
Harvard subject headings:
Europe--Intellectual life--19th century--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Humboldt, Wilhelm von, 1767-1835--Congresses.
Intellectuals--Germany--Biography--Congresses.
Princeton subject headings:
Europe--Intellectual life--19th century--Congresses.
Germany--Intellectual life--19th century--Congresses.
Humboldt, Alexander von, 1769-1859--Congresses.
Humboldt, Wilhelm von, 1767-1835--Congresses.
Intellectuals--Germany--Biography--Congresses.