The Clark County, Nevada Papers (1959-1997) contain Thalia Dondero's correspondence, speeches, performance reports, and Yucca Mountain assessments. Also included are papers from a number of agencies: Clark County School District (CCSD); Las Vegas Metropolitan Police Department (LVMPD); McCarran Airport; University Medical Center (UMC); and the Equal Opportunity Board (EOB).

The Federal Papers, (1966-1994) of Thalia Dondero contain the Federal Highway Administration impact statements concerning Nevada wilderness and wild life. The miscellaneous items include papers on preserving recreational areas, the United Way, emergency food and shelter programs, and the Nevada Test Site.