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2. United State Environmental Protection Agency (US EPA) Drinking Water Advisory: Consumer Acceptability Advice and Health Effects Analysis on Methyl Tertiary-Butyl Ether (MTBE) 1997
3. K. Mahasneh Steps Taken in Process of Phasing out Leaded Gasoline 2008
4. J. S. Christensen J. Elton Soil and Groundwater Pollution from BTEX 1996
5. National Water Master Plan, Groundwater Resources 2004