| http://www.w3.org/ns/prov#value | - See, e.g., Letter From Edward E. Reich, EPA to Clyde B. Eller, EPA Region IX (May 16, 1980), available at www.epa.gov/region7/air/nsr/ nsrmemos/shell.pdf (last visited May 16, 2012) (two facilities 1.8 miles apart and connected by pipeline are a single source because neither facility produces products independently); Letter from Edward E. Reich, EPA to Steve Rothblatt, EPA Region V (June 30, 1981)
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