§52.1821. Classification of regions.
40 C.F.R. § 52.1821
The North Dakota plan was evaluated on the basis of the following classifications:
Notes, amendments, and revision history
Amendments
[37 FR 10885, May 31, 1972]
Authority
Authority: 42 U.S.C. 7401 et seq.
Amendments
[40 FR 5521, Feb. 6, 1975]
Amendments
[37 FR 10885, May 31, 1972]