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- 19:48, 10 May 2016 Debra Tabron (talk | contribs) uploaded File:EPA-1990-State of Tech Rev-Soil Vapor Extraction System.pdf (Hutzler, N.J., B.E. Murphy, and J.S. Gierke. 1990. "State of Technology Review: Soil Vapor Extraction Systems." EPA/600/S2-89/024, U.S. Environmental Protection Agency, Risk Reduction Engineering Laboratory, Cincinnati, Ohio)