Here is a map which shows the vulnerability of world regions to desertification: http://soils.usda.gov/use/worldsoils/mapindex/desert.html.
And here is the risk of human-induced desertification: http://soils.usda.gov/use/worldsoils/mapindex/dsrtrisk.html.
Also, the NRCS website also has many more great resources for technical information about desertification!
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