Columbia subject headings:
Harvard subject headings:
Labor unions--Political activity--Poland--Wielkopolska--History.
NSZZ "Solidarność" (Labor organization). Wielkopolska--History.
Wielkopolska (Poland)
Princeton subject headings:
Labor unions--Political activity--Poland--Wielkopolska--History.
NSZZ "Solidarność" (Labor organization). Wielkopolska--History.
Wielkopolska (Poland)