• entities (en)

• anthropogenic soils (en)
• chemical soil types (en)
• climatic soil types (en)
• cultural soil types (en)
• ecological soil types (en)
• genetic soil types (en)
• layered soils (en)
• lithological soil types (en)
• mineralogical soil types (en)
• palaeosolic soil types (en)
• physiographic soil types (en)
• polygenetic soil types (en)
• stratigraphic soil types (en)
• structural soil types (en)
• textural soil types (en)

• site factors (en)

• soil classification (en)

http://aims.fao.org/aos/agrovoc/c_7204