<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">CONTROL DE CALIDAD DEL AGUA</topic></authority><related type="narrower"><topic>MEDICION DE LA CALIDAD DEL AGUA</topic></related><related type="narrower"><topic>PURIFICACION DEL AGUA</topic></related><related type="narrower"><topic>REUTILIZACION DEL AGUA</topic></related><related type="broader"><topic>CONSERVACION DEL AGUA</topic></related><related type="broader"><topic>ABASTECIMIENTO DE AGUA</topic></related><related type="broader"><topic>DISPOSICION DE AGUAS RESIDUALES</topic></related><variant type="other"><topic>Calidad del agua--Control</topic></variant><variant type="other"><topic>Manejo de la calidad del agua</topic></variant></mads>