Soils Data
Source: Natural Resources Conservation Service, USDA
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SSURGO (Soil Survey Geographic) Database
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STATSGO (State Soil Geographic) Database
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Web Soil Survey - Interactive Map - SSURGO soils types are available.
References for soils definitions
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National Soil Survey Handbook - NRCS
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Soil Survey Manual - NRCS
Links to National Databases
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Soil Series Descriptions - Link via USDA-NRCS