00490nmm a2200169Ia 4500008004100000020001800041041000800059100002000067245002800087264005900115300001700174490003000191650002400221856005100245942000700296999001700303251105s9999||||xx |||||||||||||||||und|| a9781621690832 aspa aHicks, Kelli L. 0a¿Natural o artificial? a[Madrid, España] :bRourke Educational Media, c2012 a24 páginas aMi biblioteca de ciencias aAges 9-12 Years Old uhttps://public.digitaliapublishing.com/a/24824 cCF c75302d75302