Columbia subject headings:
Harvard subject headings:
Branch libraries--Germany--Berlin--History.
Droysen, Johann Gustav, 1808-1884--Bibliography--History.
Humboldt-Universität zu Berlin. Universitätsbibliothek--Catalogs.
Humboldt-Universität zu Berlin. Universitätsbibliothek--History.
Princeton subject headings:
Droysen, Johann Gustav, 1808-1884--Library.
Humboldt-Universität zu Berlin. Bibliothek.