English: Clay County Minnesota Savanna Soils 23 %. Sourced-from: Web Soil Survey (WSS), Natural Resources Conservation Service, United States Department of Agriculture. Available online at http://websoilsurvey.nrcs.usda.gov/. NRCS/WSS native vegetation information first sorted by soil series then compiled using soil series proportion of county area (%). Accessed by Steve Nelson 10-25-10
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