Soils
World Soil-Type Maps, United Nations Food and Agriculture Organization (FAO)
World Reference Base for Soil Resources Map (Polar Projection, 1999). Soil-type map with definitions copy.
Harmonized World Soil Database Map (Mollweide Projection, 2007). Soil-type map with key copy.
Harmonized World Soil Database Map is a very slow interactive high resolution soil-type map (2010). Soil-type map with key copy.
Global Soil Information, PLOS ONE, 9(8) e105992 (2014). World Soil (0-5 cm) pH map copy.
Regional Soil Maps
USDA National Resource Conservation Service, US Midwest Cation Exchange Capacity Map jpg copy
USDA Soil Type Maps from EPA
Biota of North America Program (BONAP), US Soil pH map (2008) png copy. Zoom in to see values.
International Soil Reference and Information Centre (ISRIC), Africa CEC and pH maps png copy
European Soil Data Centre (ESDAC), Soil Atlas of Europe
Soil-types of Europe Map with key (2005) png copy
European Soil Properties Maps includes cation exchange capacity and base saturation maps (2005) pdf copy or png copy
United Nations Economic Commission for Europe (UNECE) Forestry Department, Europe Base Saturation Map (2011) pdf copy
"A China data set of soil properties", JAMES, 5, 212-224 (2013), China CEC Map png copy and China pH Map png copy
Maps of India soil types (2020) or jpg copy
"Soils of India," Current Science, 104(10), 1308–1323 (2013). See Table 4 for chemical properties or pdf copy
Global Assessment of Terrestrial Ecosystem Sensitivity to Acidic Deposition, Stockholm Environment Institute
World Sensitivity to Acidic Deposition (2002) pdf copy
Appendix I has CEC and Base Saturation values for soil types (1998) pdf copy
Definitions
FAO Soils Portal, agricultural problem soils (2000) pdf copy. See especially
Acid soils, Podzols, Acrisols and Ferralsols
Harmonized World Soil Database, chemical soil parameters (2012) pdf copy
United Nations Food and Agriculture Organization (2018), chemical properties.
Soils | What Happens to Acid Rain? | ChemConnections
Links verified 1/28/2022.