https://catalogobiblioteca.ingemmet.gob.pe/cgi-bin/koha/opac-search.pl?q=ccl=an%3A4438%20and%20su-to%3AGEOMORFOLOG%C3%83%C2%8DA%20and%20au%3AValdivia%20Frisancho%2C%20Enrique%20Jes%C3%83%C2%BAs&format=rss2 Search results for 'an:4438 and su-to:GEOMORFOLOGÍA and au:Valdivia Frisancho, Enrique Jesús' at Biblioteca - Ingemmet 0 20