Here are some of my favorite links:

Photos from the NatCam The 12 Soil Orders USDA-Natural Resources Conservation Service NRCS - Soils NRCS - Soil Survey NRCS - Idaho NRCS - State Soil Photo Gallery NRCS - Official Soil Series Descriptions NRCS - State of the Land NRCS - National Soil Characterization Data NRCS - World Soil Resources Soil Taxonomy NRCS - Field Book for Describing and Sampling Soils USDA - Soil Survey Manual Soil Survey Laboratory Methods Manual NRCS - National Soil Survey Handbook Soil Science Society of America SSSA Glossary of Soil Science Terms International Union of Soil Science International Soil Reference and Information Centre Soil and Water Conservation Society World Reference Base for Soil Resources NSTA SciLinks