World Reference Base group
USDA Soil Taxonomy suborders
Soil organic carbon content (fine earth fraction) in permilles (90% lower limit) for 2.5 cm depth
Soil pH x 10 in H2O (90% lower limit) for 2.5 cm depth
Soil texture fraction sand in percent (90% lower limit) for 2.5 cm depth
Points
Hillshade of Europe