Columbia subject headings:
Foreign workers, Polish--Social conditions.
Immigrants--Poland--Social conditions.
Poland--Emigration and immigration--Economic aspects.
Poland--Emigration and immigration--Social aspects.
Social mobility--Poland.
Harvard subject headings:
Foreign workers, Polish--Social conditions.
Immigrants--Poland--Social conditions.
Poland--Emigration and immigration--Economic aspects.
Poland--Emigration and immigration--Social aspects.
Social mobility--Poland.
Princeton subject headings:
Foreign workers, Polish--Social conditions.
Immigrants--Poland--Social conditions.
Poland--Emigration and immigration--Economic aspects.
Poland--Emigration and immigration--Social aspects.
Social mobility--Poland.