Columbia subject headings:
Harvard subject headings:
Saline waters--Arkansas River Watershed.
Saline waters--Red River Watershed (Tex.-La.)
Water quality--Arkansas River Watershed.
Water quality--Red River Watershed (Tex.-La.)
Water--Pollution--Arkansas River Watershed.
Water--Pollution--Red River Watershed (Tex.-La.)
Water-supply--Arkansas River Watershed.
Water-supply--Red River Watershed (Tex.-La.)
Princeton subject headings:
Saline waters--Arkansas River Watershed.
Saline waters--Red River Watershed (Tex.-La.).
Water--Pollution--Arkansas River Watershed.
Water--Pollution--Red River Watershed (Tex.-La.).
Water-supply--Arkansas River Watershed.
Water-supply--Red River Watershed (Tex.-La.).