Columbia subject headings:
Water conservation projects--Texas--Lower Rio Grande Valley--Finance.
Water conservation--Law and legislation--Texas--Lower Rio Grande Valley.
Water-supply--Texas--Lower Rio Grande Valley.
Harvard subject headings:
Water conservation projects--Texas--Lower Rio Grande Valley--Finance.
Water conservation--Law and legislation--Texas--Lower Rio Grande Valley.
Water-supply--Texas--Lower Rio Grande Valley.
Princeton subject headings:
Water conservation projects--Texas--Lower Rio Grande Valley--Finance.
Water conservation--Law and legislation--Texas--Lower Rio Grande Valley.
Water-supply--Texas--Lower Rio Grande Valley.