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SP 87.13330.2011
Railway, motorway and hydrotechnical tunnels. Underground railways
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€11
SP 290.1325800.2016
Water Passageways Hydraulic Structures (Discharge Sluices, Emptying and Dewatering Conduits). Rules of Projecting. With Amendment No. 1
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€13
SP 5206-90
Sanitary rules for catalytic productions of petroleum-refining and petrochemical industry
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€25