
Soil pH ©BONAP | 
Acid soils with pH < 6 ©BONAP |  Neutral soils with pH 6-7. ©BONAP |
 Basic soils with pH > 7. ©BONAP |  Serpentine and ultramafic soils and/or possible outcrops ©BONAP
| Concentration of wetlands and open water areas ©BONAP
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 Wetland soils with nutrient-rich clays ©BONAP |  Volcanic wetland soils ©BONAP
|  Undeveloped wetland soils ©BONAP |
 Weakly developed wetland soils ©BONAP
|  Shrink/swell clay wetland soils ©BONAP
|  Pine forest wetland soils ©BONAP
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 Prairie wetland soils ©BONAP |  Wetland soils with nutrient poor clays ©BONAP
|  Undeveloped soils (excluding wetlands, fluvents, and psamnents) ©BONAP
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 Acidic organic wetland soil ©BONAP
|  Non-acidic organic wetland soil ©BONAP |  Upland acidic sands ©BONAP |
 Upland acidic clays ©BONAP |  Upland acidic silts/loams ©BONAP |  Upland acidic shallow ©BONAP |
 Upland non-acidic clays ©BONAP |  Upland non-acidic shallow soils ©BONAP |  Excessively drained soils ©BONAP |
 Well-drained soils ©BONAP |  Very poorly-drained soils ©BONAP
|  Soils with nutrient-rich clays (excluding wetlands) ©BONAP |
 Volcanic soils (excluding wetlands) ©BONAP |  Gypsum soils ©BONAP |  Organic soils (excluding uplands) ©BONAP
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 Mineral soils with high organic contect (excluding prairie soils) ©BONAP
|  Mineral soils with high organic content ©BONAP |  Deep sandy soil ©BONAP |
 Limestone praire soils ©BONAP |  Salty soils (high electric conductivity) ©BONAP |  Soils with nutrient-poor clays (excluding wetlands) ©BONAP
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Shrink/swell clay soils (excluding wetlands) ©BONAP | Desert soils (excluding salt flats and gypsum) ©BONAP |  Non-wetland floodplain soils ©BONAP |
Various soils with elements of a floodplain soil ©BONAP | Upland organic soils ©BONAP |  Prairie soils (excluding wetlands) ©BONAP |
 Salt flats ©BONAP |  Pine forest soils (excluding wetlands) ©BONAP |  Rock outcrops ©BONAP
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Weakly developed soils (excluding wetlands) ©BONAP | Shallow soils (bedrock within a half meter of the surface) ©BONAP |  Man-made/modified soils ©BONAP |
Relative soil moisture based on average drainage and climate ©BONAP |  Soils of the lower 48 US states, based on dominant soil pH, textures, and wetland status (data from NRCS) ©BONAP |  Soil orders and selected suborders of the United States, based on Soil Taxonomy of the USDA NRCS ©BONAP |
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