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Lyn 21: == Bronne == * {{en}} Gradstein, F.M.; Ogg, J.G.; Schmitz, M.D. & Ogg, G.M.; '''2012''': ''A Geologic Time Scale 2012'', Elsevier, ISBN 0-444-59425-6. * {{en} } Heckel, P.H. & Clayton, G.; '''2006''': ''The Carboniferous system, use of the new official names for the subsystems, series and stages'', Geologica Acta '''4'''(3), pp 403-407. * {{en}} Lane, H.R.; Brenckle, P.L.; Baesemann, J.F. & Richards, B.; '''1999''': ''The IUGS boundary in the middle of the Carboniferous: Arrow Canyon, Nevada, USA'', Episodes '''22'''(4), pp 272-283. * {{ru}} Nemyrovska, T.I.; '''1999''': ''Bashkirian conodonts of the Donets Basin'', Ukraine. Scr. Geol. '''119''', pp 1–115.

Bashkirium: Verskil tussen weergawes