Here is the brief in Chinook Indian Nation v. Burgum:
Petition here.

Here:
Question presented:
Does a federal court have jurisdiction to recognize the existence of an Indian tribe where the findings in the Indian Tribe List Act, Public Law 103-454, sec. 103(3), provide that “Indian Tribes presently may be recognized by . . . a decision of a United States court,” and no other federal statute addresses the question of tribal recognition?
Lower court materials here.

Update:
Here are the materials in Tsi Akim Maidu of Taylorsville Rancheria v. Dept. of the Interior (E.D. Cal.):

Here is the petition in Burt Lake Band of Ottawa & Chippewa Indians v. Haaland (D.D.C.):
Most recent post here.

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