[Classification of the ash from coal from various deposits according to its chemical composition].
D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000517:prevention & control*; D003031:Coal / Q000032:analysis*; D008452:Maximum Allowable Concentration; D014586:USSR
D000393:Air Pollutants; D003031:Coal
O klassifikatsii zoly uglia razlichnykh mestorozhdenii v zavisimosti ot khimicheskogo sostava.