00345nam a2200133 a 450000500170000002000150001708200220003210000150005424500550006926000370012430000180016170000150017970000170019420251203090533.0  a0407004297  a630.0285,bD, cla  aClark J.A.  aComputer applications in agricultural environments  aLoNew DelhionbButterworhsc1987  axi,304p, 23cm  aGregson K.  aSaffell R.A.