00510nam a2200193 a 450000100080000000500110000800800410001910000190006024500490007926000370012830000100016565000250017565000130020065000220021365000250023565000150026065000240027565300170029910016862014-02-22       2002    bl uuuu     u00u1 u    #d1 aMICHALAK, P.S.  aOrganic grainbcropping system and marketing  aPennsylvania (USA): RODALEc2002  a80 p.  aAGRICULTURA ORGANICA  aCEREALES  aCONTROL DE PLAGAS  aPLANTAS DE COBERTURA  aPRODUCCION  aSISTEMAS DE CULTIVO  a631.584 MICo