Columbia subject headings:
Harvard subject headings:
Labor unions and youth--Germany--History--20th century--Congresses.
Socialism and youth--Germany--History--20th century--Congresses.
Youth movements--Germany--History--20th century--Congresses.
Princeton subject headings:
Socialism and youth--Germany--History--20th century.
Youth movements--Germany--History--20th century.
Youth--Germany--Societies and clubs.