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mini чулуу бутлуур ажилд сиднейн
бутлуур тэжээгч ажилд - дубай ажилд бутлуур. Mine Shale бутлуур . Mine Shale бутлуур. Oil shale - Wikipedia. Oil shale is an organic-rich fine-grained sedimentary rock containing kerogen (a solid mixture of organic chemical compounds) from which liquid hydrocarbons, called shale oil (not to be ...