Columbia subject headings:
Harvard subject headings:
Authors, German--19th century--Biography
Authors, German--20th century--Biography
Education in literature
Science fiction, German--19th century--History and criticism.
Science fiction, German--20th century--History and criticism.
Utopias in literature
Princeton subject headings:
Lasswitz, Kurd, 1848-1910--Bibliography.
Science fiction, German.