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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 W—Primary Precious Metals and Mercury Subcategory (§421.250 to §421.257)
SUBPART W—Primary Precious Metals and Mercury Subcategory (§421.250 to §421.257)