- Global Soil Moisture Data Bank
 - From the Department of Environmental Sciences at Rutgers University. - Humate Information and Research
- Features the paper, Organic Matter, Humus, Humate, Humic Acid, Fulvic Acid and Humin: Their Importance in Soil Fertility and Plant Health by Dr. Robert E. Pettit.
- Land Judging
- Manual, tutorial, and interactive practice field cards for the Oklahoma Land Judging competition. Also provides information on past national competitions.
- Soil Morphology, Classification, and Mapping
- Provides an overview of soil formation, weathering, organic mater, U.S. taxonomy, and mapping.
- Soil Science Society of America (SSSA)
- Acquires and disseminates information about soils in relation to crop production, environmental quality, ecosystem sustainability, and more.
 University of Aberdeen
- Details of teaching, research, and personnel.- Waterlogging and Salinity
- Software and articles on waterlogging, soil salinity, land drainage, and reclamation, developed and written by R.J.Oosterbaan.
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