https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A210%20and%20holdingbranch%3AUSU%20and%20itype%3ATESIS%20and%20holdingbranch%3AUGB%20and%20location%3ATES%20and%20au%3AM%C3%83%C2%A1rquez%20Salvador%2C%20Williams%20Edison%20and%20holdingbranch%3AUSU&format=rss2 Search results for 'an:210 and holdingbranch:USU and itype:TESIS and holdingbranch:UGB and location:TES and au:Márquez Salvador, Williams Edison and holdingbranch:USU' at Biblioteca UGB 0 20