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Electronic Code of Federal Regulations (e-CFR)
Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER C—AIR PROGRAMS
PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES
Subpart A—Meaning of Terms
40 CFR Part 81 - Subpart A - Meaning of Terms
CFR
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§ 81.1 Definitions.
