Wanting to prove my native American ancestory?

I have been told that my Grandpa was full blooded apache indian. He was born in Arizona and died well before I was born as my dad is in his early 80's and I am 31. just to give you an idea of the time frame I am looking at. Anyways where can I go for help in trying to find out if in fact he was a member of... show more I have been told that my Grandpa was full blooded apache indian. He was born in Arizona and died well before I was born as my dad is in his early 80's and I am 31. just to give you an idea of the time frame I am looking at. Anyways where can I go for help in trying to find out if in fact he was a member of an apache tribe (I have seen there a few diffrent ones), this is all to confusing of where to go next. thanks in advance.
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