Columbia subject headings:
International rivers.
Mexico--Foreign relations--United States.
Rio Grande (Colo.-Mexico and Tex.)
United States--Foreign relations--Mexico.
Water resources development--Law and legislation--Mexico.
Water resources development--Law and legislation--United States.
Harvard subject headings:
Mexico--Foreign relations--United States.
United States--Foreign relations--Mexico.
Water resources development--Law and legislation--Mexico.
Water resources development--Law and legislation--United States
Princeton subject headings:
Mexico--Foreign relations--United States.
United States--Foreign relations--Mexico.
Water resources development--Law and legislation--Mexico.
Water resources development--Law and legislation--United States.