00334nam a2200121Ia 45000030006000000080041000060400015000471000019000622450093000812600009001745460012001830050017001950STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aUnited Nations  aGuide to practical project apprisal:Social benefit cost analysis in developing countries  c1978  aEnglish20220125165621.0