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USDA Soil Survey Database

With this link, US residents can access the USDA’s and older Soil Conservation Service data on their land.  It is extremely useful to know the soil type you are dealing with – everyone who can should make use of this resource.

Important information contained in the survey includes land classification (suitability for agriculture), Class 1 to Class 8, soil name, it’s texture classification (Sandy, Loamy Sand, Sandy Loam, Loam, Clay Loam or Clay) and also, the typical organic matter range for your soil..

http://websoilsurvey.nrcs.usda.gov/app/HomePage.htm