Columbia subject headings:
Harvard subject headings:
Communists--Germany (East)--Biography
Health officers--Germany (East)--Biography.
Physicians--Germany (East)--Biography.
Zetkin, Maxim, 1883-1965.
Princeton subject headings:
Communists--Biography.
Physicians--Germany--Biography.
Socialists--Germany--Biography.
Zetkin family.
Zetkin, Klara, 1857-1933.
Zetkin, Maxim, 1883-1965.