Columbia subject headings:
Harvard subject headings:
Mexico--Foreign economic relations--United States.
Mexico--History--Revolution, 1910-1920.
Mexico--Relations--United States.
United States--Foreign economic relations--Mexico.
United States--Relations--Mexico.
Princeton subject headings:
Mexico--Foreign economic relations--United States.
Mexico--History--Revolution, 1910-1920.
Mexico--Relations--United States.
United States--Foreign economic relations--Mexico.
United States--Relations--Mexico.