Water, sanitation and hygiene standards for schools in low-cost settings

Water, sanitation and hygiene standards for schools in low-cost settings I. Adams, John text Geneva World Health Organization monographic ix, 55 p. Water, sanitation and hygiene standards for schools in low-cost settings / ABASTECIMIENTO DE AGUA AGUA POTABLE CALIDAD DEL AGUA POTABLE PROMOCION DE LA SALUD SANEAMIENTO SERVICIOS DE SALUD ESCOLAR 978-92-4-1547796 DLC 000000 20180921 148476