GOST R 58221-2018
Methods for the petrographic analysis of coals. Part 1. Vocabulary of terms

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GOST R 58221-2018

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GOSTR

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GOST R 58221-2018

GOST R 58221-2018 history

• 1970 GOST R 58221-2018 Methods for the petrographic analysis of coals. Part 1. Vocabulary of terms