00309nam a2200109Ia 450000500170000000800410001708200120005810000160007024500630008626000420014930000080019120260224040935.0260224s9999||||xx |||||||||||||| ||und||  a510 FRA  aFrance, J.  0aMathematical models in agriculture : a quantitative…….  aLondon: Boston : Butterworths, c1984  a335