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