nblib.library.kznblib.library.kz/elib/library.kz/Jurnal/Геология_01_2019... · According to...
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nblib.library.kznblib.library.kz/elib/library.kz/Jurnal/Геология_01_2019... · According to GOST 25543-88 based on the vitrinite reflectivity indicators, coals are also divided