https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A2181%20and%20itype%3ATESIS%20and%20au%3ACalles%20Merino%2C%20Nelly%20Emperatriz&format=rss2 Search results for 'an:2181 and itype:TESIS and au:Calles Merino, Nelly Emperatriz' at Biblioteca UGB 0 20