Columbia subject headings:
Harvard subject headings:
Humboldt, Wilhelm von, 1767-1835--Correspondence--Congresses.
Intellectuals--Germany--Correspondence--History and criticism--Congresses.
Schiller, Friedrich, 1759-1805--Correspondence--Congresses.
Princeton subject headings:
Humboldt, Wilhelm von, 1767-1835--Correspondence.
Intellectuals--Germany--Correspondence--History and criticism.
Schiller, Friedrich, 1759-1805. Correspondence.