Columbia subject headings:
Mexico--Relations--Pacific Area--Congresses.
Pacific Area--Relations--Mexico--Congresses.
Harvard subject headings:
Mexico--Foreign economic relations--Pacific Area--Congresses.
Mexico--Relations--Pacific Area--Congresses.
Pacific Area--Foreign economic relations--Mexico--Congresses.
Pacific Area--Relations--Mexico--Congresses.
Princeton subject headings:
Mexico--Foreign economic relations--Pacific Area--Congresses.
Pacific Area--Foreign economic relations--Mexico--Congresses.