00420nam a2200157Ia 4500008004100000020001400041082001700055100001600072245002500088260002600113300000800139650004100147650003400188653002200222700001800244170901s1971    xx            000 0 und d  a582441609  a631.46bG71S  aGray, T.R.G 0aSoil Micro Organisms  aLondonbLongmanc1971  a340  aAgriculture and related technologies  aTechnology (Applied sciences)  aSoil microbiology  aWilliams, S.T