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Code of Federal Regulations
C.F.R. Title 40—Protection of Environment
CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY
SUBCHAPTER D—WATER PROGRAMS
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PART 131—WATER QUALITY STANDARDS
Subpart A—General Provisions
(§§ 131.1 - 131.8)
Subpart B—Establishment of Water Quality Standards
(§§ 131.9 - 131.15)
Subpart C—Procedures for Review and Revision of Water Quality Standards
(§§ 131.20 - 131.22)
Subpart D—Federally Promulgated Water Quality Standards
(§§ 131.31 - 131.47)
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