Columbia subject headings:
Flood control--Law and legislation--Colorado River Valley (Colo.-Mexico)
Mexico--Boundaries--United States.
Salinity--Rio Grande (Colo.-Mexico and Tex.)
United States--Boundaries--Mexico.
Harvard subject headings:
Flood control--Law and legislation--Colorado River Valley (Colo.-Mexico)
Mexico--Boundaries--United States.
Salinity--Rio Grande.
United States--Boundaries--Mexico.
Princeton subject headings:
Flood control--Law and legislation--Colorado River Valley (Colo.-Mexico).
Mexico--Boundaries--United States.
Salinity--Rio Grande.
United States--Boundaries--Mexico.