https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AUniversidad%20Gerardo%20Barrios%20and%20holdingbranch%3AUSU%20and%20au%3AM%C3%83%C2%A1rquez%20Salvador%2C%20Williams%20Edison%20and%20holdingbranch%3AUGB&format=rss2 Search results for 'Provider:Universidad Gerardo Barrios and holdingbranch:USU and au:Márquez Salvador, Williams Edison and holdingbranch:UGB' at Biblioteca UGB 0 20