Columbia subject headings:
Immigrants--Services for--History.
Poland--Emigration and immigration--Economic aspects.
Poland--Emigration and immigration--History.
Harvard subject headings:
Emigration and immigration--Poland--19th century.
Emigration and immigration--Poland--20th century.
Emigration and immigration--Poland--Economic aspects.
Emigration and immigration--Poland--Social aspects.
Emigration and immigration--Poland--Social organizations.
Immigrants--Services for--History.
Poland--Emigration and immigration--Economic aspects.
Poland--Emigration and immigration--History.
Princeton subject headings: