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Map from "Spadoni, M., Voltaggio, M., Carcea, M., Coni, E., Raggi, A., & Cubadda, F. (2007). Bioaccessible selenium in Italian agricultural soils: Comparison of the biogeochemical approach with a regression model based on geochemical and pedoclimatic variables. Science of The Total Environment, 376(1-3), 160–177. doi:10.1016/j.scitotenv.2007.01.066











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