Authors: Sachs, JD Mellinger, AD Gallup, JL

Citation: Jd. Sachs et al., The geography of poverty and wealth, SCI AM, 284(3), 2001, pp. 70-75

Authors: Gallup, JL Sachs, JD Mellinger, AD

Citation: Jl. Gallup et al., Geography and economic development, INT REG SCI, 22(2), 1999, pp. 179