Большой англо-русский и русско-английский словарь
high-grade coal, high-quality coal, mature coal
Англо-русский словарь технических терминов
high-grade coal, high-quality coal, mature coal
Русско-английский политехнический словарь
high-grade coal, high-quality coal, mature coal
Dictionnaire technique russo-italien
carbone di (alta) qialità