Series 2: Subject Files, Subseries 3: Legislation (1851-1994) consists of correspondence, articles, memoranda, and Congressional bills, resolutions, reports, and testimony relating to a wide variety of legislative and administrative issues of concern to the AAIA. These are embodied in sometimes voluminous subject files and an extensive series of memoranda containing synopses of governmental activities impinging on Native Americans. The bulk of the latter were prepared for general circulation by the AAIA's general counsel. The scope of this subseries reflects the importance the AAIA attached to effecting change in Washington, be it in a supportive or an adversarial role. Leaders of the Association such as President Oliver La Farge, General Counsel Richard Schifter, and Executive Director William Byler took an interest in everything from the implications of Alaskan statehood to the protection and repatriation of Indian remains and artifacts to the transfer of civil and criminal jurisdiction from federal to state authorities. Attention was given to measures affecting every tribe, such as the far-reaching Indian Self-Determination and Education Assistance Act of 1975, which sought to give Native Americans a meaningful say in programs intended for their benefit, as well as to localized initiatives, such as the resolution politicizing the superintendency of the Five Civilized Tribes in Oklahoma in 1935.

Consists of additional family papers, including correspondence, documents, and personal papers. The bulk of this subseries is comprised of letters sent by Jane and Matilda Morris to Harrison Morris.

Boxes 28 through 33 contain pamphlets and other material concerning meteor craters, meteoritics, archaeology, anthropology, geology and general science topic. Others concerning Brandon Barringer / Meteors. All arranged chronologically with some by decades.