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- Oil shale
- Portal:Energy/Selected article
- Portal:Estonia/Featured article/2007 archive
- Portal:Energy/Selected article/21
- Portal:Estonia/Featured article/August 2007
- Wikipedia:Today's featured article/May 2008
- Wikipedia:Today's featured article/May 29, 2008
- Portal:Estonia/Selected article
- Portal:Estonia/Selected article/13
- User:Abyssal/Portal:Cambrian
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- User:Abyssal/Portal:Ordovician/Science, culture, and economics articles/5
- User:Abyssal/Portal:Devonian/Science, culture, and economics articles/6
- User:Abyssal/Portal:Paleogene/Science, culture, and economics articles/10
- User:Abyssal/Portal:Cenozoic/Science, culture, and economics articles/11