Columbia subject headings:
Harvard subject headings:
Socialism--Germany--History
Socialists--Germany--Biography
Sozialdemokratische Partei Deutschlands
Students--Germany--Societies, etc.--History.
Students--Political activity--Germany--History.
Princeton subject headings:
Socialism--Germany--History.
Socialists--Germany--Biography.
Sozialdemokratische Partei Deutschlands.
Students--Germany--Societies, etc.--History.
Students--Political activity--Germany--History.