00401nam a2200157Ia 4500008004100000020001500041082002000056100002000076245003600096260002600132300000800158650001400166650002000180653002500200653001800225170901s1982    xx            000 0 und d  a0582450810  a338.10941bH13I  aHaines, Michael 0aIntroduction to Farming Systems  aLondonbLongmanc1982  a214  aEconomics  aSocial sciences  aAgricultural systems  aGreat Britain