20240304 00170900 1.0 TRUE TRUE USA_ALL_gS1021_Calcic_Horizons Map showing the distribution of soils with calcic and petrocalcic horizons. Data source: Soil Survey Staff (2021). Gridded Soil Survey Geographic (gSSURGO) Database for the United States of America and the Territories, Commonwealths, and Island Nations served by the USDA-NRCS. United States Department of Agriculture, Natural Resources Conservation Service. Available online at https://gdg.sc.egov.usda.gov/. (202110 official release). Downloaded Jan. 2022. Map by D. G. Schulze, Purdue University, July 2022. Isee Map showing the distribution of soils with calcic and petrocalcic horizons. 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