Columbia subject headings:
NSZZ "Solidarność" (Labor organization)--History--Sources.
Nowa Sól (Poland)--History--20th century.
Harvard subject headings:
NSZZ "Solidarność" (Labor organization)--History--Sources.
NSZZ "Solidarność" (Labor organization)--Poland--Nowa Sól--History--Sources.
Nowa Sól (Poland)--History--20th century.
Princeton subject headings: