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- 17:43, 14 June 2021 Sophivorus talk contribs deleted page Biogas and liquid biofuels (original) (Biogas and liquid biofuels now links to the original version via {{Page data}})
- 21:37, 29 December 2006 Curtbeckmann talk contribs protected Biogas and liquid biofuels (original) (making it publicly editable, but not movable [move=sysop])
- 04:57, 12 December 2006 Curtbeckmann talk contribs protected Biogas and liquid biofuels (original) (original ported content [edit=sysop:move=sysop])