World Bank Open Knowledge RepositoryThe OKN contains World Bank published books from 2009-2012, all World Development Reports (WDRs) since 1978, Policy Research Working Papers (PRWP) from 2009-2012, Economic and Sector Work (ESW) studies from 2009-2012, journal articles from 2007-2010 published in World Bank Economic Review (WBER) and World Bank Research Observer (WBRO) (two journals published by Oxford University Press on behalf of the World Bank), content in languages other than English, and World Bank Group Annual Reports and Independent Evaluation Studies.