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CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER N—EFFLUENT GUIDELINES AND STANDARDS (Parts 400–471) > PART 421—NONFERROUS METALS MANUFACTURING POINT SOURCE CATEGORY > SUBPART U—Primary Nickel and Cobalt Subcategory (§421.230 to §421.237)
SUBPART U—Primary Nickel and Cobalt Subcategory (§421.230 to §421.237)