Thanks to Stevie for the link to the Old Indian Photos site.  It’s on Facebook, and this person has categorized old public domain photos of Native people by tribe in 329 Facebook photo Albums.

https://www.facebook.com/NativeHeritageProject/posts/450942961631638#!/pages/Native-American-Indian-Old-Photos/10150102703945578

You can read more about this project at their “About” page, including the album names so you’ll know where to look:

https://www.facebook.com/NativeHeritageProject/posts/450942961631638#!/pages/Native-American-Indian-Old-Photos/10150102703945578?sk=info

Enjoy!