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| Data sets | Publications | Expeditions | Thesaurus |
Soils (category)  | |
|---|---|
| SN | Soils, GeoRef category code 25, is one of thirty categories used to classify documents in GeoRef. Each reference in GeoRef is assigned one or more categories. Categories can be used, in addition to Terms, to refine searches (See List A.). |
| soils maps | |
|---|---|
| BT | maps |
| .soils maps | |
| RT | soils |
| SN | Added to Thesaurus in 1981. |