Columbia subject headings:
Internal security--Poland--History--20th century--Sources.
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--History--1980-1989--Sources.
Polish people--Political activity--Foreign countries.
Harvard subject headings:
Internal security--Poland--History--20th century--Sources.
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--History--1980-1989--Sources.
Polish people--Foreign countries--Political activity.
Princeton subject headings:
Internal security--Poland--History--20th century--Sources.
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--History--1980-1989--Sources.
Polish people--Political activity--Foreign countries.