Columbia subject headings:
Harvard subject headings:
Mythology, Norse, in literature.
Nationalism and literature--Germany--History.
Racism in literature.
Science fiction, German--History and criticism.
Princeton subject headings:
Extraterrestrial beings in literature--Psychological aspects--History and criticism.
Extraterrestrial beings in literature--Social aspects--History and criticism.
Fascism in literature--History and criticism.
Mythology, Germanic, in literature--20th century--History and criticism.
Science fiction, German--20th century--History and criticism.
Science fiction, German--Themes, motives--20th century--History and criticism.