25 C.F.R. § 2.208
What must I file in addition to the Notice of Appeal?
No later than 10 days after filing your Notice of Appeal, you must submit to the reviewing official, the decision-maker, and interested parties a statement of reasons that:
(a) Explains why you believe the decision was wrong;
(b) Identifies relevant information or evidence you believe the decision-maker failed to consider;
(c) Describes the relief you seek;
(d) Provides all documentation you believe supports your arguments; and
(e) Complies with the requirements of § 2.214.