https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A%2220089%22%20and%20holdingbranch%3AUSU%20and%20itype%3ABK%20and%20holdingbranch%3AUSU%20and%20su-to%3AINVESTIGACIONES%20INSTITUCIONALES%20and%20itype%3ABK%20and%20location%3AINI%20and%20holdingbranch%3AUSU%20and%20su-to%3AINGL%C3%83%C2%89S%20and%20au%3ADirecci%C3%83%C2%B3n%20de%20Investigaci%C3%83%C2%B3n%2C%20Universidad%20Gerardo%20Barrios%20and%20su-to%3AM%C3%83%C2%89TODOS%20DE%20ENSE%C3%83%C2%91ANZA&format=rss2 Search results for 'an:"20089" and holdingbranch:USU and itype:BK and holdingbranch:USU and su-to:INVESTIGACIONES INSTITUCIONALES and itype:BK and location:INI and holdingbranch:USU and su-to:INGLÉS and au:Dirección de Investigación, Universidad Gerardo Barrios and su-to:MÉTODOS DE ENSEÑANZA' at Biblioteca UGB 0 20