00309nam a2200109Ia 450000500170000000800410001702000120005805000170007010000150008724500630010226000340016520251229192539.0251229s9999    xx            000 0 und d  a0948404  aSB 731 .D53   aMarshall G 0aDiagnostics in crop production BCPC symposium cG Marshall  aLondonb Academic pressc1996