https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3AEcoe%20ediciones%2C%20and%20au%3AFierro%20Mart%C3%83%C2%ADnez%2C%20Angel%20Mar%C3%83%C2%ADa%20and%20holdingbranch%3AUGB&format=rss2 Search results for 'Provider:Ecoe ediciones, and au:Fierro Martínez, Angel María and holdingbranch:UGB' at Biblioteca UGB 0 20