WATER QUALITY. BIOLOGICAL CLASSIFICATION OF RIVERS. PART 2. GUIDANCE ON THE PRESENTATION OF BIOLOGICAL QUALITY DATA FROM SURVEYS OF BENTHIC MACROINVERTEBRATES— 10 стр.
Vitrified clay pipes and fittings and pipe joints for drains and sewers. Requirements for special fittings, adaptors and compatible accessories— 20 стр.
Vitrified clay pipes and fittings and pipe joints for drains and sewers. Requirements for special fittings, adaptors and compatible accessories— 20 стр.