World Reference Base for Soil Resources

The World Reference Base for Soil Resources (WRB) is an international soil classification system for naming soils and creating legends for soil maps. The currently valid version is the fourth edition 2022.[1] It is edited by a working group of the International Union of Soil Sciences (IUSS).

WRB, 4th edition (2022)
  1. ^ IUSS Working Group WRB (2022). "World Reference Base for Soil Resources, 4th edition" (PDF). IUSS, Vienna.