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Properties and structure of hard coals from a borehole Niedobczyce IG-1 in the Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents 4. The structure of asphaltenes separated from tetralin extracts of coals

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Properties and structure of hard coals from the borehole Niedobczyce IG-1 in Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents. 1. Variations in properties of the coals along the depth of the borehole

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Properties and structure of hard coals from a borehole Niedobczyce IG-1 in the Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents 3. Changes in the chemical structure of primary tars with increase in coalification degree of the parent coals

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Properties and structure of hard coals from the borehole Niedobczyce IG-1 in the Rybnik Coal District, Upper Silesian Coal Basin, their petrographic and group constituents. 2. Variations in petrographic composition of the coals along the depth of borehole and alterations in structure of the coals characterised by vitrinites spectroscopic analyses (X-ray, IR)

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