00417nam a2200181Ia 4500008004100000041001200041082000800053082001100061100001700072100001100089245003300100260001300133260002400146260000900170300001500179365002500194650001600219150909s9999    xx            000 0 und d  aEnglish  a630  bDAV/CO  aDavidson J    eEditor  aConservation and agriculture  aNew York  bJohn Wiley and Sons  c1977  a252  Pages  aUSD.6.50              aAgriculture