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Soils with strong human influence that either contain significant amount of artefacts or have a sealed layer.

IUSS Working Group WRB (2022) World Reference Base for Soil Resources. International soil classification system for naming soils and creating legends for soil maps. 4th Editio. Vienna, Austria: International Union of Soil Sciences (IUSS). Available at: https://www.isric.org/explore/wrb.

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