UPDATE 1-Halliburton pleads guilty to destroying Gulf spill evidence
* Third company to plead guilty over Gulf spill * Halliburton to pay $200,000 fine * $55 million to be donated to fish and wildlife group July 25 (Reuters) - Halliburton Co has agreed to plead guilty to destroying evidence related to the 2010 Gulf of Mexico oil spill, the U.S. D
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