003880000a22001450004500020001500000060000800015082001500023100001800038100001500056245004100071260004300112260000900155300000800164650007000172  a0853348278  a100  a630.18 DEN  aBlackie,  M J  aDent,  J B  aSystems in simulation in agriculture  aLondon, Applied science publishers Ltd  c1979  a180  aSystems- Simulation- Agriculture/ Agriculture- Simulation methods