Honestly don't expect to find much. Other than very general stuff, you're not going to find authentic tribal practices in books or online.
Real authentic tribal practice lives in those specific tribal communities and unless you are a member of the tribe, highly engaged in the tribe or know someone who is odds are you'll never see it. I can't speak for all tribes, but in mine the language both written and verbal understanding along with culture and folklore is very important to the practice. Those who supplement oral practice do so with manuscripts written only in the syllabary and do not share those texts with anyone other than those they teach or pass it on to.
If Crowley did include first nation spirituality, it was probably very general and vague information.
Having read most of his works, I have not come across anything, and doubt anyone will. Many tribal practices hold superstitious beliefs and simply have faith in certain principles. For one, Crowley despised such things and his work is the epitome of stripping dogma and superstition out of magick- for better or for worse- and then experimenting and forming your own conclusions (beliefs).
Certain features will be common, such as the use of music in ritual, particularly drumming, the use of dance, and poetry (song). Words of power, certain correspondences between the natural world and mystical world. Using drugs to alter consciousness. All this can be found in Crowley's works, but when you get in to specifics, things will differ dramatically.