00338nam a2200133Ia 45000030006000000080041000060400015000471000020000622450074000822500010001562600009001665460012001750050017001870STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aRobertson, C.A.  aIntroduction to agricultural production economics and farm management  aFifth  c1983  aEnglish20220125165559.0