https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Guill%C3%A9n%2C%20Julio%20CesarMachuca%2C%20N%C3%A9stor%22&sort_by=relevance&format=rss 2 0 50 ISBN: https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=288 By Guillén, Julio CesarMachuca, Néstor.

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]]> https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=288 ISBN: https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=287 By Guillén, Julio CesarMachuca, Néstor.

]]> Place hold on Matematica I

]]> https://biblioteca.utla.edu.sv/cgi-bin/koha/opac-detail.pl?biblionumber=287