The regulatory subject files document the federal and state regulation of Native American gaming and the greater United States gaming industry (1789, 1793, 1823-1832, 1851, 1883, 1886, 1903, 1909, 1971-2009). The bulk of materials date from 1990 to 2009. Documents dating from the eighteenth, nineteenth, and early-twentieth centuries are reproductions of Supreme Court opinions and legislative documents. Materials include Senate and House of Representatives bills, court opinions, testimonies before Congress, the Federal Register, congressional records, reports, pamphlets, agendas, informational booklets, press releases, memos, correspondence, notes, legal briefs, and newspaper articles. Materials also document various legal topics such as amending the Indian Gaming Regulatory Act; class II and class III gaming regulations; government-to-government relationships; Department of the Interior secretarial procedures; sovereignty; and trust lands.

The sociocultural subject files contain materials collected by Dr. Spilde about sociocultural issues related to Native Americans, Native American gaming, and gaming in the United States. Materials date from 1980 to 2007, with the bulk of materials dating from 1994 to 2005. Materials include socioeconomic impact studies and reports; annual reports; periodicals; memos; correspondence; notes; video recordings of televised programs; conference materials; promotional materials; booklets, pamphlets, and packets; journal articles; law review articles and legal briefs; and newspaper articles. The materials concern a variety of topics such as compulsive gambling, Native American health, environmental policy, the social cost of casino gaming, criminal activities, card counting, Native American culture, and the social impacts of gaming in the United States.