Columbia subject headings:
Harvard subject headings:
Deutscher Metallarbeiter-Verband--Buildings--History.
Metal-workers--Labor unions--Germany--Baden-Württemberg--History--20th century.
Nazis--Germany--Baden-Württemberg--History--20th century.
Political crimes and offenses--Germany--Baden-Württemberg--History--20th century.
Princeton subject headings:
Deutscher Metallarbeiter-Verband--Buildings--History.
Metal-workers--Labor unions--Germany--Baden-Württemberg--History--20th century.
Nazis--Germany--Baden-Württemberg--History--20th century.
Political crimes and offenses--Germany--Baden-Württemberg--History--20th century.