АР 13067779 “Study of mineralogical and geochemical features of sediments of the Karaganda coal basin in order to identify products of explosive volcanism in coals” – p.m. Kopabaeva А.N.
АР 13067779 “Study of mineralogical and geochemical features of sediments of the Karaganda coal basin in order to identify products of explosive volcanism in coals” – p.m. Kopabaeva А.N.