Columbia subject headings:
German literature--19th century--History and criticism.
German literature--20th century--History and criticism.
Technology in literature.
Harvard subject headings:
German literature--19th century--History and criticism
German literature--20th century--History and criticism
Industries in literature.
Technology in literature.
Princeton subject headings:
German literature--19th century--History and criticism.
German literature--20th century--History and criticism.
Industries in literature.
Technology in literature.