00384 a2200097 4500 362.50723 RVA Ravallion, Martin Policy Research Working Paper : The Mystery of the Vanishing Benefits Ms. Speedy Analyst's Introduction to Evaluation / Martin Ravallion Washington : The World Bank, 1999 40p. ; ill. ; 30 cm Mystery of the Vanishing Benefits 2150 2150 0 0 0 0 NIT NIT CE 0000-00-00 0 362.50723 RVA NIT-1228 2017-01-05 2017-01-05 BK