00333nam a2200109Ia 4500008004100000041000800041084001200049100001700061245008000078260004900158653001600207160808s1986    xx            000 0 eng d  aeng  aF.22CC  aVeena, D. R.  aBio - gas technology:ba study of community Bio gas plant /cby D. R. Veena  aNew Delhi :bAshish Publishing House,c1986.  aTyechnology