Here is the opinion in United States v. Ruiz.
Briefs:

Update:
Here are materials in Muscogee (Creek) Nation v. Free (N.D. Okla.):
8 Motion for Preliminary Injunction

Here are relevant materials in United States v. Bullhead (D. Minn.):

Here are the new materials in Muscogee (Creek) Nation v. City of Henryetta (N.D. Okla,):
Prior post here.

Here are the materials in Bertrand v. State of Oklahoma (Okla. Ct. Crim. App.):

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