CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES > SUBPART D—Identification of Mandatory Class I Federal Areas Where Visibility Is an Important Value (§81.400 to §81.437) > 81.423—North Dakota.

81.423—North Dakota.

Area name	Acreage	Public Law establishing	Federal land manager
Lostwood Wild	5,557	93-632	USDI-FWS.
Theodore Roosevelt, NP	69,675	80-38	USDI-NPS.

Code of Federal Regulations

[54 FR 41098, Oct. 5, 1989]