Columbia subject headings:
Poland--Politics and government--1796-1918.
Poland--Politics and government--1918-1945.
Socialism--Poland--History.
Working class--Political activity--Poland--History.
Harvard subject headings:
Poland--Politics and government--1796-1918
Poland--Politics and government--1918-1945
Political parties--Poland
Socialism--Poland
Working class--Poland--History.
Working class--Political activity--Poland--History.
Princeton subject headings: