Columbia subject headings:
Harvard subject headings:
Feminism--Germany--History
Klein, Wolfram.
Proletariat.
Women and socialism.
Women--Employment.
Zetkin, Klara, 1857-1933
Princeton subject headings:
Feminism--Germany--History.
Labor movement--Germany--History.
Women--Germany--History.
Working class women--Germany--History.
Zetkin, Klara, 1857-1933.