00479cam a22000977a 4500008004000000082001700040245021200057260008500269300001000354700001700364180718b1982   xxu||||| |||| 00| 0 eng d  aO91x54 C333b  aBiological indicators and indices of environmental pollution: proceedings of the workshop held at Osmania University, Hyderabad, India during 21-23 September, 1981 under a who grantcby A. R. Zafar...[et al]  aNew DelhibCentral Board for the prevention and control of water pollutionc1982  a209p.  aZafar, A. R.