00545nam a2200181Ia 4500001001100000005001700011008004100028020002200069090001200091245010100103260003600204300002700240500001900267650002300286650002300309650001400332999001700346000001628220251012174746.0  950207s1991    xxu           00    eng  a9211165008 (pbk.)04a628.16600aRational use of water and its treatment in the chemical industrycEconomic Comission for Europe   aNew YorkbUnited Nationsc1991   ax, 146p.bill.c30 cm.  aECE/ CHEM/ 78  0aChemicals industry 0aWater purification 0aWater use  c10147d10147