Baker Hughes and Halliburton said they are prepared to comply with the Environmental Protection Agency's request to voluntarily disclose the chemicals used in hydraulic fracturing. Halliburton "supports and continues to" adhere to standards "promoting the forthright disclosure of the chemical additives," said spokeswoman Teresa Wong. "We are reviewing the request and intend to cooperate," said Gary Flaharty, vice president of investor relations for Baker Hughes.

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