00299nam a2200121Ia 45000030006000000080041000060400015000471000019000622450058000812600009001395460012001480050017001600STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aEarl Heady, O.  aEconomics of agricultural production and resource use  c1964  aEnglish20220125165552.0