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Several layers of steel casing typically enclose a well bore. The empty spaces between can be sealed with cement.
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A version of the original investigation was co-published with the Pittsburgh Post-Gazette and appeared in that newspaper on Sunday, April 26, 2009.
A version of the original investigation was co-published with the Albany Times Union and appeared in that newspaper on Monday, April 27, 2009
A version of the original investigation was co-published with the Denver Post and appeared in that newspaper on Wednesday, April 22, 2009.
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