Columbia subject headings:
Emigration and immigration--Political aspects--Poland.
Poland--Emigration and immigration--19th century.
Poland--History--Revolution, 1863-1864.
Harvard subject headings:
Emigration and immigration--Political aspects--Poland.
Poland--Emigration and immigration--19th century.
Poland--Emigration and immigration--History--19th century.
Poland--Emigration and immigration--Political aspects.
Poland--History--Revolution, 1863-1864
Princeton subject headings: