2022. (). Soil Survey Staff: Keys to Soil Taxonomy. 12th edition. Natural Resources Conservation Service. U.S. Department of Agriculture. Washington D.C., USA, 2014. Further reading W. Zech, P. Schad, G. Hintermaier-Erhard: Soils of the World. Springer, Berlin 2022, Chapter 9.3.3. External links profile photos (with classification) WRB homepage profile photos (with classification) IUSS World of Soils Pedology Types of soil Patterned grounds