43 CFR §3270.12

1. (a)Geothermal resource operational orders, for detailed requirements that apply nationwide;
2. (b)Notices to lessees, for detailed requirements on a statewide or regional basis;
3. (c)Other orders and instructions specific to a field or area;
4. (d)Permit conditions of approval; and
5. (e)Oral orders, which BLM will confirm in writing.