The Morgan Sweeney Photograph Collection (approximately 1922-1969) consists of black-and-white photographic prints of Boulder City, Nevada, and Lake Mead and Hoover Dam areas, located on the border between Arizona and Nevada. The images depict the interior, exterior, and construction stages of Hoover Dam (Boulder Dam). There is also an aerial photograph of Boulder City, Nevada.

The Tom Mead Photograph consists of a black-and-white photographic print from 1928. The image depicts members present for the Presidential signing of the Boulder Canyon Project Act on December 21, 1928, including Elwood Mead, Calvin Coolidge, and Hiram W. Johnson.

Oral history interview with Arlene Matthews Smith conducted by Elizabeth Nelson Patrick on March 26, 1981 for the Ralph Roske Oral History Project on Early Las Vegas. Smith discusses living in Caliente, Nevada and recalls her family history. Smith also discusses going to high school in Panaca, Nevada, construction of Boulder (Hoover) dam, prohibition, and the growth of Las Vegas, Nevada.

Oral history interview with Goldie Spicer conducted by Elmer Herren on February 12, 1977 for the Ralph Roske Oral History Project on Early Las Vegas. Spicer discusses working as a cocktail waitress. She also talks about the boom that Las Vegas, Nevada went through when the first casinos were being built, and when the construction of the Boulder (Hoover) Dam occurred. She discusses El Rancho, Twin Lakes, and the Taylor Ranch.

Oral history interview with Mary R. Stout conducted by Greg Rowland on February 20, 1980 for the Ralph Roske Oral History Project on Early Las Vegas. In this interview, Stout discusses her personal history and living in Boulder City, Nevada. Stout describes living in "Ragtown," a makeshift settlement for workers constructing Hoover Dam (Boulder Dam) before Boulder City was established. She also describes her father's duties as a pipe fitter while working on the construction of Hoover Dam (Boulder Dam) and how Boulder City has changed and evolved. Stout concludes by talking about nuclear weapons tests, her careers, and gambling in Boulder City.

Oral history interview with Therese Courture Thomas conducted by Roberta F. Zaplatilek on February 29, 1980 for the Ralph Roske Oral History Project on Early Las Vegas. In this interview, Thomas discusses her family history and arriving to Boulder City, Nevada in 1930. Thomas describes housing in Boulder City and explains that people needed to build their own homes in the 1930s. She then discusses prostitution becoming illegal in Nevada, the Helldorado Parade, and the construction of Hoover Dam (Boulder Dam). Lastly, Thomas recalls how her musical career began and entertainment in casinos.

Oral history interview with Marjory Gusewelle Phillips conducted by Jodie C. Tenuta on May 11, 1976 for the Ralph Roske Oral History Project on Early Las Vegas. In this interview, Phillips discusses growing up in Las Vegas, Nevada and describes various recreational activities throughout the city. Phillips then discusses the significance of the Helldorado Parade to locals and how the parade brought the community together. Phillips later recalls watching the Boulder (Hoover) Dam being constructed and the events around the opening of the dam.