When coal turned gold.

Ижил төстэй зүйлс

• When coal turned gold - the making of maharatna company
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• Chemistry and technology of coal
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• THE STORY BEHIND COAL
  -н: SOMERVIL BARBARA
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• The Story Behind Coal
• Turning garbage into Gold : an introduction to vermiculture biotechnology
  -н: Bhawalkar, Uday
  Хэвлэсэн: (1993)