Columbia subject headings:
Harvard subject headings:
Allgemeiner Deutscher Gewerkschaftsbund--History--Sources.
Labor unions and youth--Germany--Berlin--History--20th century--Sources.
Labor unions and youth--Germany--History--20th century--Sources.
Princeton subject headings:
Allgemeiner Deutscher Gewerkschaftsbund--History--Sources.
Labor unions and youth--Germany--Berlin--History--20th century--Sources.
Labor unions and youth--Germany--History--20th century--Sources.