Why Study Soils? Soil notes Photographs of sand boils. Oregon State University's Soils (wiki) OpenAg.info's Soil Science Encyclopedia (wiki) European Soil Portal EUSOILS (wiki) Soil-Net.com A free schools-age educational site teaching about soil and its importance. LandIS Soils Data for England and Wales a pay source for GIS data on the soils of England and Wales and soils data source; they charge a handling fee to researchers. LandIS Free Soilscapes Viewer Free interactive viewer for the Soils of England and Wales Wossac the world soil survey archive and catalogue. Geo-technological Research Paper, IIT Kanpur, Dr P P Vitkar – Strip footing on weak clay stabilized with a granular pile http://pubs.nrc-cnrc.gc.ca/cgi-bin/rp/rp2_abst_e?cgj_t78-066_15_ns_nf_cgj4-78 The State Dirt Company Sells soil as a souvenieer from different U.S. States. Percolation Test Learn about Soil, Percolation, Perc and Perk Tests. USDA-NRCS Web Soil Survey Inventory of the soil resource across the U.S.