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In: Metal Bulletin Daily, 2008-04-28, Heft 106, S. 19-19Online serialPeriodicalZugriff:
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In: Metal Bulletin Daily, 2008-02-01, Heft 97, S. 1393-1393Online serialPeriodicalZugriff:
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In: Metal Bulletin Daily, 2008, Heft 96, S. 988-988Online serialPeriodicalZugriff:
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In: State Journal (WV), Jg. 29 (2013-11-08), Heft 44, S. 7-7ZeitungsartikelZugriff:
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In: PR Newswire, 2013-02-04ZeitungsartikelZugriff:
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In: Mining Engineering, Jg. 59 (2007-10-01), Heft 10, S. 8-8Online serialPeriodicalZugriff:
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In: ENP Newswire, 2013-04-12ZeitungsartikelZugriff:
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In: ENP Newswire, 2012-05-08ZeitungsartikelZugriff:
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In: Coal Age, Jg. 109 (2004-10-01), Heft 10, S. 24-27Online serialPeriodicalZugriff:
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In: Electricity Journal, Jg. 14 (2001-08-01), Heft 7, S. 9-9academicJournalZugriff:
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In: Coal Age, Jg. 117 (2012-09-01), Heft 9, S. 6-6Online serialPeriodicalZugriff:
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In: Coal International, Jg. 253 (2005-05-01), Heft 3, S. 93-93Online serialPeriodicalZugriff:
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In: Coal International, Jg. 253 (2005-03-01), Heft 2, S. 48-48Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 114 (2009-03-01), Heft 3, S. 4-4Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 112 (2007-11-01), Heft 11, S. 8-8Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 111 (2006-11-01), Heft 11, S. 16-16Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 110 (2005-06-01), Heft 6, S. 10-10Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 110 (2005-03-01), Heft 3, S. 4-4Online serialPeriodicalZugriff:
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In: Coal Age, Jg. 105 (2000-05-01), Heft 5, S. 7-7Online serialPeriodicalZugriff: