Bravo-Ortega, Claudio The relative richness of sthe poor? : Natural resources,Human capital, and economic growth / Claudio Bravo-Ortega & Jose De Gregorio - Washington DC, : The World Bank (WB) , 2005 - 47p. : ill. ; 25 cm. - Policy Research Working Paper No. 3484 . Subjects--Topical Terms: Economic growthPrimary sectorEducationTechnology Gov. Doc. Class. No.: UN WB PRWP-3484