Here:
Brief of Amicus Curiae Lipan Apache Tribe of Texas
Lower court materials here.
Here is the opinion in Mitchell v. Bailey.
Briefs and lower court materials here.
Here are the briefs in Mitchell v. Bailey:
Lower court materials in Mitchell v. Bailey (W.D. Tex.):
Here is the motion in Hall v. Tesoro High Plains Gas Co. LLC (D.N.D.):
Prior post here.
Here is the opinion in State of Texas v. Ysleta del Sur Pueblo.
Briefs:
Here are the materials in Ysleta Del Sur Pueblo v. City of El Paso (W.D. Tex.):
Here is the complaint in Tap Pilam Coahuiltecan Nation v. Alamo Trust, Inc. (W.D. Tex.):
Update (3/19/21):
Here are the materials so far in Hall v. Tesoro High Plains Gas Co. LLC (D.N.D.):
Here are materials in a related case, Chase v. Andeavor Logistics LP (W.D. Tex.):
Here is the order granting Texas’ motion for summary judgment in State of Texas v. Ysleta del Sur Pueblo (W.D. Tex.):
Briefs are here.
Here are updated materials in State of Texas v. Ysleta del Sur Pueblo (W.D. Tex.):
83 Tribe Motion to Dismiss First Amended Complaint
97 Texas Motion to Dismiss Counterclaims
121 First Amended Counterclaims
146 Texas Motion for Summary Judgment
147 Texas AG Motion for Summary Judgment