<?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/">CONSTRUCCION DE TUNELES</topic></authority><related type="narrower"><topic>Blindaje en galería</topic></related><related type="narrower"><topic>PERFORACION</topic></related><related type="narrower"><topic>PERFORADORAS DE ROCAS</topic></related><related type="narrower"><topic>REVESTIMIENTO DE TUNELES</topic></related><related type="narrower"><topic>VOLADURAS (MINERIA)</topic></related><related type="other"><topic>EXCAVACION</topic></related><related type="broader"><topic>EXCAVACION DE ROCAS</topic></related><related type="broader"><topic>INGENIERIA DE MINAS</topic></related><related type="broader"><topic>INGENIERIA</topic></related><related type="broader"><topic>MOVIMIENTOS DE TIERRAS</topic></related><related type="broader"><topic>CONSTRUCCIONES SUBTERRANEAS</topic></related><variant type="other"><topic>Túneles--Construcción</topic></variant></mads>