Here is the unpublished opinion in Agua Caliente Band of Cahuilla Indians v. Riverside County. An excerpt:

In Agua Caliente Band of Mission Indians v. County of Riverside, 442 F.2d 1184 (9th Cir. 1971), we held that this very tax is permissible. Plaintiff argues that our cursory preemption analysis there is clearly irreconcilable with White Mountain Apache Tribe v. Bracker, 448 U.S. 136 (1980), and therefore not controlling. See Miller v. Gammie, 335 F.3d 889, 893 (9th Cir. 2003) (en banc) (permitting a three-judge panel to depart from circuit precedent if, but only if, that precedent is clearly irreconcilable with a later Supreme Court or en banc decision). We disagree.

Materials are here.