https://biblioteca.ugb.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=an%3A591%20and%20holdingbranch%3AUGB%20and%20au%3ABeer%2C%20Ferdinand%20P&format=rss2 Search results for 'an:591 and holdingbranch:UGB and au:Beer, Ferdinand P' at Biblioteca UGB 0 20