Columbia subject headings:
Harvard subject headings:
Basques--America--History.
Béarn (France)--Population--History.
France--Emigration and immigration--History.
Pays Basque (France)--Population--History.
Princeton subject headings:
America--Emigration and immigration--History.
Basques--America--History.
Béarn (France)--Emigration and immigration--History.
Pays Basque (France)--Emigration and immigration--History.