https://catalogobiblioteca.ingemmet.gob.pe/cgi-bin/koha/opac-search.pl?q=ccl=an%3A%2215052%22%20and%20au%3AWinkler%2C%20Wilfried%20and%20su-geo%3AECUADOR&format=rss2 Search results for 'an:"15052" and au:Winkler, Wilfried and su-geo:ECUADOR' at Biblioteca - Ingemmet 0 20