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Senin, 25 Agustus 2014
Transition Metals IGCSE 2
http://www.docbrown.info/page04/4_75trans.htm
Kamis, 14 Agustus 2014
IGCSE Chemistry
http://chemistryatdulwich.wikispaces.com/file/view/12.+The+Alkali+Metals+v1.0.ppt
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