Soil Biology Primer
A 54 pg. booklet available from the Soil and Water Conservation Society.
Environmental Literacy Council – Soil
Descriptions of soils and soil ecosystems and links to U.S. and international data.
Sustainable Soil Management
Informational guide produced by ATTRA (Appropriate Technology Transfer for Rural Areas).
Introduction to soil quality maintained by USDA-NRCS Soil Quality Institute.
Soil Quality Information Sheets
Illustrated fact sheets prepared by USDA-NRCS. Fourteen titles available (in .pdf format) including topics such as Organic Matter, Aggregate Stability, and Soil Biodiversity.