GOST 9147-1980 Laboratory porcelain ware and apparatus. Specifications*, 2024-04-19 Update
GOST 15934.1-1991 history
2013GOST 32221-2013 Copper concentrates. Methods of analysis
1991GOST 15934.1-1991 Copper concentrates. Methods for determination of copper content
GOST 15934.1-1991 Copper concentrates. Methods for determination of copper content was changed to GOST 32221-2013 Copper concentrates. Methods of analysis.