Columbia subject headings:
Harvard subject headings:
Educators--Germany--18th century--Correspondence.
Educators--Germany--19th century--Correspondence.
Humboldt, Wilhelm von, 1767-1835--Correspondence.
Philosophers--Germany--18th century--Correspondence.
Philosophers--Germany--19th century--Correspondence.
Statesmen--Germany--18th century--Correspondence.
Statesmen--Germany--19th century--Correspondence.
Princeton subject headings:
Educators--Germany--18th century--Correspondence.
Educators--Germany--19th century--Correspondence.
Humboldt, Wilhelm von, 1767-1835--Correspondence.
Philosophers--Germany--18th century--Correspondence.
Philosophers--Germany--19th century--Correspondence.
Statesmen--Germany--18th century--Correspondence.
Statesmen--Germany--19th century--Correspondence.