https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversidad%20Gerardo%20Barrios%20and%20au%3AUniversidad%20Gerardo%20Barrios%20and%20itype%3ABK%20and%20holdingbranch%3AUSU%20and%20au%3ACastro%20L%C3%83%C2%B3pez%2C%20Walter%20Antonio%20and%20su-to%3AM%C3%83%C2%89TODOS%20DE%20ENSE%C3%83%C2%91ANZA&format=rss2 Search results for 'Provider:Universidad Gerardo Barrios and au:Universidad Gerardo Barrios and itype:BK and holdingbranch:USU and au:Castro López, Walter Antonio and su-to:MÉTODOS DE ENSEÑANZA' at Biblioteca UGB 0 20