https://catalogobiblioteca.ingemmet.gob.pe/cgi-bin/koha/opac-search.pl?q=ccl=an%3A62972%20and%20su-geo%3APER%C3%83%C2%9A%20and%20su-geo%3AVALLE%20DE%20LOS%20VOLCANES%20and%20au%3ARivera%20Porras%2C%20Marco%20Antonio&format=rss2 Search results for 'an:62972 and su-geo:PERÚ and su-geo:VALLE DE LOS VOLCANES and au:Rivera Porras, Marco Antonio' at Biblioteca - Ingemmet 0 20