R. Lynn and T. Vanhanen (2006) IQ and global inequality (Augusta, GA: Washington Summit) compile a cross-country data on IQ.
See section 2 of Eppig et al. (2010) for the list of papers validating this data.
Used by Eppig et al. (2010) (see also an article from The Economist magazine) to show its correlation with the disability-adjusted life years lost due to 28 infectious diseases.