Archaeolink has a large listing of Native American Social Studies. I haven't read much of it yet. There are 75 to 100 tribes or societies listed (that's without my actually having counted them, just an at a glance guess) and hundreds of web pages sources. We will each have to use our own judgement on the value of the individual sites but it was such a large resource I thought I'd share it with you.
Also at the bottom of this page there is a place where it has:
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