Columbia subject headings:
Harvard subject headings:
Arbeiter-Turn- und Sportbund--History.
Sports--Germany--History--20th century.
Working class--Physical training--Germany--History.
Working class--Recreation--Germany--History.
Princeton subject headings:
Arbeiter-Turn- und Sportbund--History.
Sports--Germany--History--20th century.
Working class--Physical training--Germany--History.
Working class--Recreation--Germany--History.