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U.S. Code
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TITLE 42 - THE PUBLIC HEALT...
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CHAPTER 85—AIR POLLUTION PR...
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SUBCHAPTER I—PROGRAMS AND A...
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Part C—Prevention of Signif...
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subpart ii—visibility protection (§§ 7491 – 7492)
subpart ii—visibility protection (§§ 7491 – 7492)
§ 7491. Visibility protection for Federal class I areas
§ 7492. Visibility