Columbia subject headings:
Harvard subject headings:
Berlin (Germany)--Intellectual life--19th century.
Berlin (Germany)--Intellectual life--Pictorial works.
Humboldt, Alexander von, 1769-1859.
Humboldt, Wilhelm von, 1767-1835.
Intellectuals--Germany--Berlin--Biography.
Princeton subject headings:
Berlin (Germany)--Intellectual life--19th century.
Berlin (Germany)--Intellectual life--Pictorial works.
Humboldt, Alexander von, 1769-1859.
Humboldt, Wilhelm von, 1767-1835.
Intellectuals--Germany--Berlin--Biography.