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ГОСТ 21427.2-83

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ГОСТ 21534-76

ГОСТ 21489-76

Угли бурые, каменные и антрациты. Разделение на стадии метаморфизма и классы по показателю отражения витринита
Brown coals, hard coals and anthracites. Classification by ranks and classes according to reflectance index of vitrinite

SKU: 2842 Category: GOST - State standards

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