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Chapter six: Inequality
http://ucatlas.ucsc.edu
The University of California, Santa Cruz, Atlas of Global Inequality includes downloadable maps and graphics.
http://www.undp.org
The site of the United Nations Human Development Programme (UNDP) contains links to its annual Human Development Report.
http://www.wider.unu.edu/
Includes access to the United Nations University–World Institute for Development Economics Research (UNU-WIDER) database on world income inequality.