HeinOnline's American Law Institute Library has the most comprehensive collection of drafts for the Restatements of the Law. Members must be logged in to jenkinslaw.org to access this database. HeinOnline is also available in the library.
Westlaw, available on the library's Westlaw computers, also includes select drafts for the Restatements of the Law.
Jenkins has select drafts in print in the library. Search the Jenkins' catalog for Restatement* Draft* "American Indians" for a full list of available drafts.