The Clark County Planning Commission Research Library Collection (1911-2004) consists of reports, publications, and proposals gathered by the Clark County Planning Commission that focus on the environmental impact of proposed developments, construction, or infrastructure improvements around the county. The collection contains materials related to various local, state, federal, and inter-agency workshops, committees, and agencies. Documents include activity reports, impact statements, annual budgets and reports, and detailed studies. The majority of the collection dates from 1970 to 1999.

The Clark County 208 Water Quality Management Plan Records contain reports produced by consultants and agencies for the Clark County Board of County Commissioners to create the Clark County, Nevada 208 Water Quality Management Plan (1960-1990). The collection also includes amendments and studies about the implementation of the plan.