Source 1) published by a famous museum; probably deals with archaeological science involved in repatriation; "resource guide" in the title implies list of sources or topic bibliography; may be a "magic solution" in providing research guidance
Source 2) can be expected to cover arguments in favor of repatriation; published by a foundation advocating repatriation; may represent Native American viewpoint; seems to evaluate policies of Smithsonian; may contain topic bibliography
Source 3) congressional reports are often authoritative sources of information; should deal with effects of key legislation allowing repatriation; raises question of United States' credibility in dealing with people it has oppressed