Columbia subject headings:
Harvard subject headings:
Croce, Benedetto, 1866-1952
History--Philosophy--History--19th century
Humboldt, Wilhelm von, 1767-1835.
Princeton subject headings:
Croce, Benedetto, 1866-1952.
History--Philosophy--History--19th century.
Humboldt, Wilhelm von, 1767-1835.