The Sierra Club Toiyabe Chapter Records (1951 to 2021) are composed of files from Sierra Club officers and environmental activists in the Southern Nevada (formerly Las Vegas) Group of the Toiyabe Chapter. The collection documents the involvement of the Southern Nevada group in a variety of environmental concerns, such as air quality, transportation, urbanization, and nuclear issues, in which the chapter has expressed interest. The records are comprised of correspondence, memoranda, meeting minutes and agendas, newspapers, magazines, newsletters, pamphlets, press releases, legislation, recommendations, resolutions, and general information. Due to the group’s location in the heart of the Mojave Desert, the collection provides excellent case studies of significant changes in the post-World War II American environmental movement, notably the increased recognition of the worth of desert lands.

The Irwin and Susan Molasky Papers (early 1900s-2012, bulk 1970-2012) primarily contain materials related to real estate development work by Irwin Molasky with his company, the Molasky Group of Companies, in Las Vegas, Nevada. In addition, the collection includes personal photographs (early 1900s-2011, bulk 1970-2011) of family members, friends, and events, as well as a Proclamation from Clark County, Nevada to establish the Molasky Family Park.

The Peg and George E. Crockett Family Photographs (approximately 1940-2008) are comprised of aerial photographs of Alamo Airport (later McCarran International Airport) and the surrounding Las Vegas Valley in the 1940s and 1950s. Photographs of the interior, exterior, and airfield at Alamo Airport document the early stages of what is now one of the busiest international airports in the United States. The collection also contains audiovisual material, which depict events including the Miss Rodeo America pageant and the Sahara Cup boat races on Lake Mead, and locations including Fremont Street in downtown Las Vegas, Nevada and Hoover Dam. A significant portion of the collection consists of photographs of the Crockett family at various events, on family vacations, and their home in Las Vegas, Nevada.

The Basic Magnesium Inc. (BMI) Records and Photographs (1933-1965) document the planning, construction, and management of the BMI magnesium manufacturing plants near present-day Henderson in Clark County, Nevada and a magnesium mining operation in Gabbs, Nye County, Nevada. Materials include chronological reports, press releases, telegrams, budgets, building diagrams, maps, and black-and-white photographic prints. The records document employee housing and infrastructure projects, magnesium production statistics, and employee data. The photographic prints, which include many aerial images, provide a visual record of the construction of the plant, the mining operation, and the associated support facilities and employee housing.