00335nam a2200109Ia 450000500170000008000180001724500960003526000250013130000220015650000290017858300180020720260716043556.0  a01.01.06 U581  aGuide to practical project appraisal : social benefit-cost analysis in developing countries  bUNaNew YorkUSc1978  aviii, 121, [6] p.  aBibliography: p. 115-117  c3/15/05kJOYD