Columbia subject headings:
Harvard subject headings:
America--Emigration and immigration--History.
Immigrants--Latin America--History
La Rioja (Spain)--Emigration and immigration--History.
La Rioja (Spain)--History.
La Rioja (Spain)--Relations--Latin America.
Latin America--Relations--Spain--La Rioja.
Riojans--America--History.
Spaniards--America--History.
Spaniards--Latin America--History
Princeton subject headings:
America--Emigaration and immigraton--History.
La Rioja (Spain)--Emigration and immigration--History.
La Rioja (Spain)--History.
La Rioja (Spain)--Relations--Latin America.
Latin America--Relations--Spain--La Rioja.
Spaniards--America--History.