Columbia subject headings:
Harvard subject headings:
Labor movement--Poland--Lublin (Voivodeship)--History.
Lublin (Poland : Voivodeship)--Politics and government.
Socialism--Poland--Lublin (Voivodeship)
Socialism--Poland--Lublin (Voivodeship)--History.
Socialist parties--Poland--Lublin (Voivodeship)--History.
Working class--Poland--Lublin (Voivodeship)--Political activity--History.
Princeton subject headings:
Working class--Political activity--Poland--Lublin (Voivodeship).