Soil thickness changes across the conterminous USA from 1950 to 2016 shows erosion and conservation effects

Yakun Zhang, University of Wisconsin Madison, Madison, WI, United States, Alfred E Hartemink, University of Wisconsin Madison, Soil Science, Madison, WI, United States, Tom Vanwalleghem, Universidad de Córdoba, Departamento Agronomía, Córdoba, Spain and Benito Roberto Bonfatti, State University of Minas Gerais, Passos, Brazil