The largest collection of Native American press materials in the world housed in the Sequoyah Research Center and American Native Press Archives. Dan Littlefield (firstname.lastname@example.org), Jim Parins (email@example.com), and Bob Sanderson (firstname.lastname@example.org) have been traveling to tribal councils all across America at their own expense every summer for over thirty years requesting that the press materials be made available to them. A very large and high quality collection of Native American art that makes the trip to Little Rock worth the effort all by itself.
Archival agreements for personal collections:
Maher, W. J. (1994). Ensuring continuity and preservation through archival service agreements. Archival Issues, 19 (1), 5-18; there is a model agreement included as an appendix.