Soils of the World
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/use/?cid=nrcs142p2_054013

Wiley InterScience


This site features a global map showing the major occurrences of the seven different soil orders of the world; alfisols, ultisols, mollisols, spodosols, vertisols, oxisols, and aridisols. Users can observe how the soil orders are correlated with global climate zones. Clicking on each soil order in the map legend yields a photograph of an example soil profile for that order.

This resource is referenced here: