soils of the world. Rome: FAO. W. Zech, P. Schad, G. Hintermaier-Erhard: Soils of the World. Springer, Berlin 2022. IUSS Working Group WRB: World Reference Base for Soil Resources, fourth edition. International Union of Soil Sciences, Vienna 2022. (). Current national systems Agriculture Canada Expert Committee on Soil Survey. (1987). The Canadian system of soil classification (2nd ed.). Ottawa: Canadian Government Publishing Centre. Avery, B. W. (1980). Soil classification for England and Wales: higher categories. Cranfield, England: Cranfield University, Soil Survey & Land Research Centre/National Soil Resources Institute. Baize, D., & Girard, M. C. (Eds.). (1995). Référentiel pédologique 1995. Paris: Institut National de la Recherche Agronomique. Baize, D., & Girard, M. C. (Eds.). (1998). A sound reference base for soils: The "Référentiel Pédologique" (English translation by Hodgson J.M., Eskenazi N.R., & Baize D. ed.). Paris: Institut National de la Recherche Agronomique. Baize, D., & Girard, M. C. (Eds.). (2008). Référentiel pédologique, troisième édition. Association française pour l’étude du sol (Afes). Versailles, France. Hewitt, A. E. (1992). Soil classification in New Zealand: legacy and lessons. Australian Journal of Soil Research, 30, 843-854. Hewitt, A. E. (2010). New Zealand soil classification, third edition. Manaaki Whenua - Landcare Research. Lincoln, Canterbury, New Zealand. Isbell, R. F. and the National Committee on Soil and Terrain. (2016). The Australian soil classification, second edition. CSIRO. Clayton South, Victoria, Australia. Soil Classification Working Group. (2018). Soil classification: a natural and anthropogenic system for South Africa, third edition. Agricultural Research Council; Institute for Soil, Climate and Water. Pretoria, RSA. Soil Survey Staff. (1999). Soil taxonomy: a basic system of soil classification for making and interpreting soil surveys (2nd ed.). Washington, DC: US Department of Agriculture Soil Conservation Service. Current technical systems Technical soil classification systems focus on representing some specific facet or quality of the soil, rather than a direct pedogenetic classification. Such technical classifications are developed with specific applications in mind, such as soil-water relationships, land quality assessment or geotechnical engineering. Boorman, D. B., Hollis, J. M., & Lilly, A. (1995). Hydrology of soil types: a hydrologically-based classification of the soils of the United Kingdom (No. 126): UK Institute of Hydrology. Klingebiel, A. A., & Montgomery, P. H. (1961). Land capability classification. Washington, DC: US Government Printing Office. Sanchez, P. A., Palm, C. A., & Buol, S. W. (2003). Fertility capability soil classification: a tool to help assess soil quality in the tropics. Geoderma, 114(3-4), 157-185. American