Columbia subject headings:
Fantasy fiction, German--History and criticism.
Science fiction, German--History and criticism.
Utopias in literature.
Harvard subject headings:
Future, The, in literature.
Science fiction, German--History and criticism.
Technology in literature.
Utopias
Princeton subject headings:
Fantasy fiction, German--History and criticism.
Science fiction, German--History and criticism.
Utopias in literature.