Columbia subject headings:
Working class--Poland--Białystok Region.
Harvard subject headings:
Białystok (Poland : Voivodeship)--Politics and government.
Communist parties--Poland--Białystok (Voivodeship)--History--20th century.
Working class--Poland--Białystok (Voivodeship)--Political activity--History--20th century.
Princeton subject headings:
Białystok (Poland : Voivodeship)--Politics and government.
Communist parties--Poland--Białystok (Voivodeship)--History--20th century.
Working class--Political activity--Poland--Białystok (Voivodeship)--History--20th century.