Coal petrography in the Ruhr hard coal industry
Kutzner, Reinhold
International journal of coal geology, 1987-11, Vol.9 (1), p.45,51,53,55,57,59,61,63,65-49,51,53,55,57,59,61,63,75
[Periódico revisado por pares]
Amsterdam: Elsevier B.V
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