Opinion for the Court filed by Chief Judge MARKEY.
MARKEY, Chief Judge:
Petitioners Kennecott Corporation (Kennecott), Phelps Dodge Corporation, Bunker Hill Company (Bunker), Molycorp, Inc. (Molycorp), Asarco, Inc. (Asarco) and Magma Copper Company (Magma) seek review of the final regulations of the Environmental Protection Agency (EPA) promulgated under Section 119 of the Clean Air Act (Act) as amended 42 U.S.C. § 7419, and governing issuance of primary...
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