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	mads.xsd"><authority><topic authority="http://www.serbi.ula.ve/tematres/vocab/">PERFORACION</topic></authority><related type="narrower"><topic>LODOS DE PERFORACIÓN</topic></related><related type="broader"><topic>PETROLEO</topic></related><related type="broader"><topic>INGENIERIA HIDRAULICA</topic></related><related type="broader"><topic>GAS NATURAL</topic></related><related type="broader"><topic>CONSTRUCCION DE TUNELES</topic></related></mads>