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

Author: Matuszewska A.   John A.   Jasienko S.  

Publisher: Elsevier

ISSN: 0378-3820

Source: Fuel Processing Technology, Vol.50, Iss.2, 1997-02, pp. : 117-130

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