Biological indicators and indices of environmental pollution: proceedings of the workshop held at Osmania University, Hyderabad, India during 21-23 September, 1981 under a who grant 
by A. R. Zafar...[et al] 
 - New Delhi  Central Board for the prevention and control of water pollution  1982 
 - 209p. 
<br/><br/><label>Dewey Class. No.: </label>O91x54 C333b