(a) These regulations apply to all public lands.(b) These regulations also govern the preparation of resource management plans when the only public land interest is the mineral estate.48 FR 20368, May 5, 1983, as amended at 81 FR 89661 , Dec. 12, 2016; 82 FR 60555 , Dec. 21, 2017 81 FR 89661, 1/11/2017; 82 FR 60555, 12/21/2017