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The USDA Web Soil Survey site began providing secure public access to the national soils information system in August 2005. Currently, NRCS has soils maps and data available online for more than 95% of the nation's counties and expects to have data for 100% of counties in the near future. The site will be updated and maintained online as the single authoritative source of soil survey information, USDA says. To view the website go to http://soils.usda.gov/survey
A List of Published Soil Surveys (S599 A1 L57x) is available online at: http://soils.usda.gov/survey/printed_surveys/ - For details on print volumes owned by the ISU Library see: http://instr.iastate.libguides.com/content.php?pid=125129&sid=1075574#3288406