FORMATION CONDITIONS OF THE PALEOGENE COALS IN THE SULA-UDAISKE DEPOSIT OF THE DNIEPER-DONETS COAL-BEARING AREA von ЗАЙЦЕВА, Л.Б., ІВАНОВА, А.В., ГАВРИЛЬЦЕВ, В.Б.

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TONSTEINS AND THEIR ROLE IN THE FORMATION OF THE PETROGRAPHIC COMPOSITION OF COALS von ІВАНОВА, А.В., ЗАЙЦЕВА, Л.Б.

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VOLCANISM AS AN IMPORTANT FACTOR IN THE FORMATION OF THE MATERIAL-PETROGRAPHIC COMPOSITION OF COAL von Іванова, А.В., Зайцева, Л.Б.

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