00553nam a2200217Ia 4500008004100000020001800041041001200059082000800071082001100079100002400090100001900114100002200133100001100155245007000166260000800236260002500244260000900269300001500278365002500293650001700318150901s9999    xx            000 0 und d  a9780521477034  aEnglish  a630  bCON/CR  aCassman Kenneth g    aConnor David J  aLoomis Robert s    eAuthor  aCrop ecology: productivity and management in agricultural systems  aUsa  bCambridge university  c2011  a515  Pages  a4419.77/-             aCrop ecology