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- 16:01, 3 August 2016 Debra Tabron (talk | contribs) uploaded File:Palmer-1994-Nat Att Hexavalent Chromium.pdf (Palmer, C.D. and Puls, R.W., 1994. Natural attenuation of hexavalent chromium in groundwater and soils. United States Environmental Protection Agency, EPA/540/5-94/505.)