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Sergius Manalu

2 ºÝºÝߣShares141 Followers89 Followings
2 ºÝºÝߣShares141 Followers89 Followings

Presentations(2)Ìý

Global Warming
Global WarmingGlobal Warming
Global Warming
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Lapisan Ozon
Lapisan Ozon Lapisan Ozon
Lapisan Ozon
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