43 C.F.R. § 21.7 Occupancy by trespassers.
Title 43 - Public Lands: Interior
Occupants of cabin sites who do not hold a valid permit for the occupancy or use of the site, shall be required to surrender occupancy, failing which legal action shall be taken. Nothing herein shall grant any rights to a trespasser.
Title 43: Public Lands: Interior
PART 21—OCCUPANCY OF CABIN SITES ON PUBLIC CONSERVATION AND RECREATION AREAS
§ 21.7 Occupancy by trespassers.

