Columbia subject headings:
German literature--History and criticism--Theory, etc.
Mehring, Franz, 1846-1919.
Harvard subject headings:
Mehring, Franz, 1846-1919.
Proletariat--History.
Socialism and culture--Germany--History.
Princeton subject headings:
German literature--History and criticism--Theory, etc.
Mehring, Franz, 1846-1919.