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GOST 25702.9-83
Raremetallic concentrates. Method for the determination of sum of niobium and tantalum pentoxide
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GOST 9931-85
The cylindrical shells of the steel welded vessels and apparatus. Types, main characteristics and dimensions
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GOST 2082.10-81
Molybdenum concentrates. Method for determination of wolfram anhydride content
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