00329nam a2200121Ia 45000030006000000080041000060400015000471000016000622450063000782600037001415460012001780050017001900STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGrigg, D.B.  aAgricultural systems of the world an evolutionary approach  bCambridge university pressc1974  aEnglish20220125165556.0