Columbia subject headings:
Harvard subject headings:
George, Stefan, 1868-1933.
Historians--Germany--Biography
Kantorowicz, Ernst H. (Ernst Hartwig), 1895-1963.
Kantorowicz, Ernst Hartwig, 1895-1963. Kaiser Friedrich der Zweite.
Princeton subject headings:
George, Stefan, 1868-1933.
Kantorowicz, Ernst Hartwig, 1895-