00288nam a2200109 a 450000500170000000800410001704100080005810000180006624500410008426400420012530000110016720260717072130.0260701s1978    ii            000 0 eng d  aeng1 aSharma, P. D.10aElements of ecology /cSharma, P. D. 1aMeerut :bRastogi Publication,c1978.  a358 p.