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• Bentor, Yinon. Chemical Element.com - Manganese.   http://www.chemicalelements.com/elements/mn.htm. Apr. 18, 1999.

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• Bentor, Yinon. Chemical Element.com - Manganese. http://www.chemicalelements.com/elements/mn.html. Feb. 17, 1999

• "Chemical compound." Encyclopędia Britannica Online.
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• "Manganese." Manganese Institute. http://www.manganeseinstitute.com/mn-book/p4-history.html. Feb18/99.

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