Columbia subject headings:
Mexico--Relations--United States.
Mexico-United States Interparliamentary Group.
United States--Relations--Mexico.
Harvard subject headings:
Mexico--Relations--United States.
Mexico-United States Interparliamentary Group.
United States--Relations--Mexico.
Princeton subject headings:
Mexico--Relations--United States.
Mexico-United States Interparliamentary Group.
United States--Relations--Mexico.