Columbia subject headings:
Marxian economics.
Marxian school of sociology--Germany.
Socialism--Germany.
Socialists--Germany.
Sozialdemokratische Partei Deutschlands.
Harvard subject headings:
Marxian economics.
Marxian school of sociology--Germany.
Socialism--Germany
Socialists--Germany
Sozialdemokratische Partei Deutschlands
Princeton subject headings:
Communism--Germany.
Germany--History--William II, 1888-1918.
Political parties--Germany.
Sozialdemokratische Partei Deutschlands.