Columbia subject headings:
Harvard subject headings:
Niederrheinischer Verband christlicher Textilarbeiter--History.
Textile workers--Labor unions--Germany--Krefeld--History.
Zentralverband christlicher Textilarbeiter--History.
Princeton subject headings:
Catholic labor unions--Germany (West)--Krefeld--History.
Textile workers--Labor unions--Germany (West)--Krefeld--History.