Columbia subject headings:
Mexico--Foreign relations--1910-1946.
Mexico--Foreign relations--Spain.
Spain--Foreign relations--1886-1931.
Spain--Foreign relations--Mexico.
Harvard subject headings:
Mexico--Foreign relations--1910-1946.
Mexico--Foreign relations--Spain.
Spain--Foreign relations--1886-1931.
Spain--Foreign relations--Mexico
Princeton subject headings:
Mexico--Foreign relations--Spain.
Mexico--History--1867-1910.
Mexico--History--1910-1946.
Spain--Foreign relations--Mexico.
Spaniards--Mexico--History.