Russian standards PDF
Nature protection. Lands. Classification of disturbed lands for the purpose of reclamation
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Environmental protection. Air pollution. Terms and definitions
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Pipeline valves. Wedge gate valves for trunk oil pipelines and oil product pipelines. General specifications
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Pipeline valves. Ball valves for trunk oil pipelines and oil product pipelines. General specifications
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Pipeline valves. Four-way cocks for trunk oil pipelines and oil product pipelines. General specifications
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