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"3 M's Big Cleanup" (Environment, June 5, 2000)


Corrections & Clarifications

"3M's big cleanup" (Environment, June 5, 2000)

"3M's big cleanup" (Environment, June 5) should have reported that detection techniques in 1997 turned up evidence of organic fluorines in human blood at levels below 50 parts per billion. Earlier tests were sensitive to just 500 parts per billion.


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