Columbia subject headings:
Mexico--Foreign economic relations--United States--Congresses.
Mexico--Foreign relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.
Harvard subject headings:
Mexico--Foreign economic relations--United States--Congresses.
Mexico--Foreign relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.
Princeton subject headings:
Mexico--Foreign economic relations--United States--Congresses.
Mexico--Foreign relations--United States--Congresses.
United States--Foreign economic relations--Mexico--Congresses.
United States--Foreign relations--Mexico--Congresses.