Columbia subject headings:
America--Emigration and immigration--History--Sources--Bibliography.
Poland--Emigration and immigration--History--Sources--Bibliography.
Polish people--America--History--Sources--Bibliography.
Harvard subject headings:
America--Emigration and immigration--History--Sources--Bibliography.
Poland--Emigration and immigration--History--Sources--Bibliography.
Polish people--America--History--Sources--Bibliography.
Princeton subject headings:
Poland--Emigration and immigration--History--Bibliography.
Polish people--North America--History--Bibliography.
Polish people--South America--History--Bibliography.