Columbia subject headings:
German poetry--19th century--History and criticism.
German poetry--20th century--History and criticism.
Railroads--Poetry--History and criticism.
Harvard subject headings:
German poetry--19th century--History and criticism
German poetry--20th century--History and criticism
Railroads--Poetry--History and criticism.
Princeton subject headings:
German poetry--19th century--History and criticism.
German poetry--20th century--History and criticism.
Railroads--Poetry--History and criticism.