Columbia subject headings:
Harvard subject headings:
Mexico--Emigration and immigration--History.
Mexico--Foreign economic relations--Spain.
Mexico--History--1867-1910.
Spain--Emigration and immigration--History.
Spain--Foreign economic relations--Mexico.
Spaniards--Mexico--History.
Princeton subject headings:
Mexico--Emigration and immigration--History.
Mexico--Foreign economic relations--Spain.
Mexico--History--1867-1910.
Spain--Emigration and immigration--History.
Spain--Foreign economic relations--Mexico.
Spaniards--Mexico--History.