Russian standards
Fertilizers. Extraction of phosphorus soluble in mineral acids
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Fertilizers. Extraction of phosphorus which is soluble in neutral ammonium citrate
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Fertilizers. Extraction of total calcium, total magnesium, total sodium and total sulfur in the forms of sulfates
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Fertilizers. Extraction of water-soluble calcium, magnesium, sodium and sulfur in the form of sulfates
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Safety in electroheat installations. Part 21. Particular requirements for resistance heating equipment. Heating and melting glass equipment
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