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• (cur | prev) 18:29, 18 March 2014‎ 74in5y4p (Talk | contribs)‎ (9,347 bytes) (→only 13. "It is compared with the previous data: new section) (undo)
• (cur | prev) 17:10, 18 March 2014‎ 74in5y4p (Talk | contribs)‎ (6,164 bytes) (→the effluent COD concentration increased significantly: new section) (undo)
• (cur | prev) 13:05, 18 March 2014‎ 74in5y4p (Talk | contribs)‎ (3,388 bytes) (three is to be more practical for the people)