GOST 8011-1974
The Caucasus coals for pulverized burning. Specifications
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GOST 8011-1974
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GOST 8011-1974
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GOSTR
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GOST 8011-1974
GOST 8011-1974 history
1970
GOST 8011-1974
The Caucasus coals for pulverized burning. Specifications
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