Columbia subject headings:
Varnhagen von Ense, Karl August, 1785-1858.
Harvard subject headings:
Authors, German--19th century--Correspondence
Humboldt, Alexander von, 1769-1859--Correspondence.
Scientists--Germany--Correspondence.
Varnhagen von Ense, Karl August, 1785-1858
Varnhagen von Ense, Karl August, 1785-1858--Correspondence.
Princeton subject headings: