Columbia subject headings:
Harvard subject headings:
Europe--Emigration and immigration--History--20th century.
European federation
France--Emigration and immigration--History--20th century.
Polish people--France--History--20th century.
Polish people--Political activity--France--History--20th century.
Princeton subject headings:
Europe--Emigration and immigration--History--20th century.
European federation.
France--Emigration and immigration--History--20th century.
Polish people--France--History--20th century.
Polish people--Political activity--France--History--20th century.