Encyclopedias, Almanacs, Transcripts, and Maps
- Sofer, Mosheh
- Softshell Turtles (Trionychidae)
- Sohm, Rudolf
- Soil and Water Conservation Society
- Soil Compaction
- Soil Conservation Service
- Soil Consistency
- Soil Eluviation
- Soil Illuviation
- Soil Liner
- Soil Loss Tolerance
- Soil Organic Matter
- Soil Profile
- Soil Survey
- Soil Texture
- Sol Invictus
- Solar Constant Cycle
- Solar Detoxification
- Solar Energy Research, Development and Demonstration Act (1974)
- Solar Energy, Historical Evolution of the Use of