00323nam a2200097Ia 4500082002500000100007400025245008900099260002300188300000900211500000500220  a614.7720942bG786.SE  aGreat Britain and Ireland, Housing and Local Government, Ministry of-  aStandards of effluents to rivers with particular reference to industrial effluentsb  aLondonbHMSOc1968  a20p.  a