https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AEditorial%20Salvadore%C3%83%C2%B1a%20Hermanos%20Unidos%2C&format=rss2 Search results for 'Provider:Editorial Salvadoreña Hermanos Unidos,' at Biblioteca UGB 0 20