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Problems in studying the quality of coal beds during geologic exploration

, : Problems in studying the quality of coal beds during geologic exploration. Razvedka i Okhrana Nedr 6(Pages 33-35

Coal evaluation, ash content, error, Carboniferous, USSR, Donets basin.


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Littlewood, A.H.; Stilwell, J.H., 1983: The vascular features of plexiform neurofibroma with some observations on the importance of pre-operative angiography and the value of pre-operative intra-arterial embolisation. The presence of abnormal feeding vessels in plexiform neurofibromata of the head and neck has been demonstrated by angiography in three patients. Attention is drawn to the possibility of dangerous bleeding in the treatment of these lesions. Two ot...

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