problemática social en el desarrollo de la frontera Tulcán-Ipiales, sector comercial Miranda Realpe, Jorge Humberto creator author. text bibliography ec 2018 Primera edición. monographic spa 1 online resource. Jorge Humberto Miranda Realpe. Includes bibliographical references. s-ec--- s-ck--- Informal sector (Economics) Ecuador Tulcán Social aspects Informal sector (Economics) Colombia Ipiales Social aspects HD2346.E2 ebook 9789942914576 https://www.digitaliapublishing.com/a/118821/ https://www.digitaliapublishing.com/a/118821/ DGITA 230405 DIGUPLCAR0013 eng