NF P12-121-5/CN*NF EN 771-5+A1/CN:2017 Specification for masonry units - Part 5 : manufactured stone masonry units - National addition to NF EN 771-5+A1:2015
2017NF P12-121-5/CN*NF EN 771-5+A1/CN:2017 Specification for masonry units - Part 5 : manufactured stone masonry units - National addition to NF EN 771-5+A1:2015