https://catalogobiblioteca.ingemmet.gob.pe/cgi-bin/koha/opac-search.pl?idx=an%2Cphr&q=42%26limit%3Davailable%26limit%3Dau%3ASillitoe%2C%20Richard%20H.%26limit%3Dsu-to%3ACOBRE%20PORFIRITICO&format=rss2 Search results for 'an,phr: 42&limit=available&limit=au:Sillitoe, Richard H.&limit=su-to:COBRE PORFIRITICO' at Biblioteca - Ingemmet 0 20