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- saatkac.info.tr Chelyabinsk
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- nms.ac.uk explore-our-collections/stories/natural…
- britannica.com Cities & Towns Cities & Towns C-G
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- http://kaira.sgo.fi 2013/02/are-2012-da14-and-…
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- edition.cnn.com 2013/10/09/world/europe/space-…