Columbia subject headings:
Harvard subject headings:
La Rioja (Spain)--Emigration and immigration--History--20th century.
Mexico--Emigration and immigration--History--20th century.
Spaniards--Mexico--History--20th century
Princeton subject headings:
Businessmen--Mexico--Biography.
Immigrants--Mexico--Registers.
La Rioja (Spain)--Biography.
La Rioja (Spain)--Emigration and immigration--History.
Mexico--Biography.
Mexico--Emigration and immigration--History.
Spaniards--Mexico--Registers.