Columbia subject headings:
Unruh, Fritz von, 1885-1970--Political and social views.
Utopias in literature.
Harvard subject headings:
Unruh, Fritz von, 1885-1970--Political and social views.
Utopias in literature.
Princeton subject headings:
Unruh, Fritz von, 1885-1970--Political and social views.
Utopias in literature.