Here's some places to start looking:
http://www.ipl.org/div/natam/
http://en.wikipedia.org/wiki/Categor...erican_writers
I did have at least one more site saved, but that link is on the hard drive in the box in the corner...for $1000, I might be able to easily locate it
Anyway, I can vouch for Jimmy Santiago Baca(read his autobiography), Thomas King(Medicine River), and Sherman Alexie(Ten Little Indians).