25 C.F.R. § 91.15 Suspension or amendment of regulations.
Title 25 - Indians
The regulations in this part may be suspended or amended at any time by the Secretary of the Interior: Provided, That such amendments or suspension shall not serve to change the terms or conditions of any mortgage approved in accordance with §91.8(a).
Title 25: Indians
PART 91—GOVERNMENT OF INDIAN VILLAGES, OSAGE RESERVATION, OKLAHOMA
§ 91.15 Suspension or amendment of regulations.

