00309nam a2200121Ia 4500003000400000008004100004020001400045040000800059100002100067245005500088260003500143300000900178LDD181029s9999    xx            000 0 und d  a198545231  cLDD  aBrockington, N.R 0aComputer modelling in agriculturecN.R Brockington  aOxfordbClearendon Pressc1979  a156p