Columbia subject headings:
Harvard subject headings:
La Purificación Tepetitla (Mexico)--Social conditions.
Water-supply, Rural--Mexico--La Purificación Tepetitla.
Water-supply, Rural--Mexico--Purificación Tepetitla.
Water-supply--Mexico--Texcoco de Mora.
Princeton subject headings:
La Purificación Tepetitla (Mexico)--Social conditions.
Water-supply, Rural--Mexico--La Purificación Tepetitla.