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Regulations last checked for updates: Nov 22, 2024
Title 40 - Protection of Environment last revised: Nov 20, 2024
All Titles
Title 40
Chapter I
Part 51
Subpart P - Subpart P—Protection of Visibility
authority:
23 U.S.C. 101
;
42 U.S.C. 7401-7671q.
source:
36 FR 22398, Nov. 25, 1971, unless otherwise noted.
cite as:
40 CFR 51.306
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