Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3181.4 Inclusion of non-Federal lands

(a) Where State-owned land is to be unitized with Federal lands, approval of the agreement by appropriate State officials must be obtained prior to its submission to the proper BLM office for final approval. When authorized by the laws of the State in which the unitized land is situated, appropriate provision may be made in the agreement, recognizing such laws to the extent that they are applicable to non-Federal unitized land.

(b) When Indian lands are included, modification of the unit agreement will be required where appropriate. Approval of an agreement containing Indian lands by the Bureau of Indian Affairs must be obtained prior to final approval by the authorized officer.