Columbia subject headings:
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--Social conditions--1980-1989--Sources.
SMOT--History--Sources.
Soviet Union--Social conditions--1945-1991--Sources.
Working class--Poland--History--Sources.
Working class--Soviet Union--History--Sources.
Harvard subject headings:
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--Social conditions--1980---Sources.
SMOT--History--Sources.
Soviet Union--Social conditions--1945-1991--Sources.
Working class--Poland--History--Sources.
Working class--Soviet Union--History--Sources.
Princeton subject headings:
NSZZ "Solidarność" (Labor organization)--History--Sources.
Poland--Social conditions--1980-1989--Sources.
SMOT--History--Sources.
Soviet Union--Social conditions--1945-1991--Sources.
Working class--Poland--History--Sources.
Working class--Soviet Union--History--Sources.