▁the ▁Vo y ages ▁Ext ra ord ina ires , ▁each ▁of ▁Ver ne ' s ▁nov els ▁was ▁published ▁success ively ▁in ▁several ▁different ▁formats . ▁This ▁resulted ▁in ▁as ▁many ▁as ▁four ▁distinct ▁ed itions ▁of ▁each ▁text ▁( l abeled ▁here ▁according ▁to ▁current ▁practice ▁for ▁Ver ne ▁bibli ograph ies ): ▁▁ ▁Éditions ▁pré - original es ▁( pre - original ▁ed itions ): ▁Serial ization ▁in ▁a ▁period ical , ▁usually ▁Het zel ' s ▁own ▁bi week ly ▁Mag as in ▁d ' É ducation ▁et ▁de ▁ré c ré ation ▁(" Mag azine ▁of ▁Education ▁and ▁Rec re ation ", ▁founded ▁ 1 8 6 4 ). ▁The ▁serial ized ▁install ments ▁were ▁illustrated ▁by ▁artists ▁on ▁Het zel ' s ▁staff , ▁such ▁as ▁Éd ou ard ▁Ri ou , ▁Lé on ▁Ben ett , ▁and ▁George ▁R oux . ▁ ▁Éditions ▁original es ▁( original ▁ed itions ): ▁complete ▁un ill ustr ated ▁texts ▁published ▁in ▁book ▁form ▁at ▁ 1 8 mo ▁size . ▁( Sim ilar ▁versions ▁in ▁the ▁slightly ▁larger ▁ 1 2 mo ▁size , ▁with ▁illustr ations ▁taken ▁from ▁the ▁serial ization , ▁are ▁also ▁considered ▁éditions ▁original es .) ▁ ▁Cart onn ages ▁dor és ▁et ▁color és ▁( g ild ed ▁and ▁colored ▁bind ings ): ▁Complete ▁ed itions ▁of ▁the ▁text , ▁published ▁in ▁grand ▁in - 8 º ▁(" large ▁oct avo ") ▁book ▁form ▁with ▁a ▁lav ish ly ▁decor ated ▁cover . ▁These