File talk:Manganknolle.jpg

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Terms of license complied with.Dieter Lohmann; Nadja Podbregar (2 November 2011) (in German) Im Fokus: Bodenschätze: Die Jagd nach Seltenen Erden und anderen Rohstoffen, Springer Verlag, p. 51 Retrieved on 13 May 2012. DOI: 10.1007/978-3-642-22611-3. ISBN: 9783642226106.

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