For the Native American researcher, mailing lists can be a very useful source.  There are many knowledgeable people subscribed to the lists and are willing to provide you with suggestions on where and how to research.  At the bottom of this page you will find a link for listings of Tribes by State, this is a new resource, so give them a try!!! Please take a look at this page How to write a Query for suggestions and ideas on how to write a Query.