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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 Y—Primary Rare Earth Metals Subcategory (§421.270 to §421.277)
SUBPART Y—Primary Rare Earth Metals Subcategory (§421.270 to §421.277)