00349nam a2200121Ia 4500008004100000082002300041100001500064245005100079260003700130300001000167600001500177650003500192140224s9999    xx            000 0 und d  a631.147+631.871 P6  aGaur, A.C.  aHandbook of organic farming and biofertilizers  ajaipurbAmbica Book Agencyc2006  a667p.  a A.C. Gaur  aBiofertilizers,Organic farming