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- 15:51, 10 May 2016 Debra Tabron (talk | contribs) uploaded File:EPA-2012-A Citizens Guide to soil vapor extraction and air sparging.pdf (EPA. 2012. A Citizen’s Guide to Soil Vapor Extraction and Air Sparging. EPA/542/F-12/018, U.S. Environmental Protection Agency, Office of Solid Waste and Emergency Response, Washington, D.C)