Columbia subject headings:
Humboldt, Alexander von, 1769-1859.
Humboldt, Wilhelm von, 1767-1835.
Harvard subject headings:
Humboldt, Alexander von, 1769-1859.
Humboldt, Wilhelm von, 1767-1835.
Intellectuals--Germany--Biography.
Philosophers--Germany--Biography
Scientists--Germany--Biography
Statesmen--Germany--Prussia--Biography.
Princeton subject headings:
Humboldt, Alexander von, 1769-1859.
Humboldt, Wilhelm von, 1767-1835.