The William S. Park Photograph Collection (approximately 1870-1960) consists of black-and-white photographic prints and negatives of the families of William S. Park, John S. Park, and John William Park, as well as photographs of the Thomas children, half-siblings of John William Park's daughter Virginia. The majority of the images show locations in Las Vegas, Nevada with a smaller number taken in Kentucky, Oklahoma, Colorado, and California. Also included are three photograph albums of William S. and John William Park as children.

The Joanne de Longchamps Papers date from 1938 to 1985 and document de Longchamps' career as a poet as well as her personal life. The collection contains photocopies of her published poems, poetry journals and magazines containing her work, and photocopies of her unpublished typewritten poetry. It also contains original correspondence from Joanne de Longchamps to her mother, Ruth Cutten, as well as photocopies of her correspondence to poet Harold Witt.

The Baneberry Nuclear Test Trial Records (1969-1989) contain documents of a federal court case regarding a 1970 Nevada Test Site nuclear test and the resultant radioactive cloud which may have exposed and subsequently injured the test site workers. The consolidated suits, William Nunamaker vs. the United States and Harley Roberts vs. the United States, came to trial January 1979, in Federal District Court, Las Vegas, U.S. District Judge Roger Foley presiding. The materials in the collection consist of court documents, such as transcripts of the trial, briefs, findings and statements, an appeal, orders, defense and plaintiff exhibits, and indices to the exhibits and witnesses as well as a glossary of terms.

The Las Vegas Ambassadors Collection (1968-1985) primarily consists of a scrapbook, newspaper articles, and photographs documenting the activities of the Las Vegas Ambassadors youth singing group. The materials were compiled by Harry LaFavor, the Ambassadors' business manager, who co-founded the group with Norman Kaye and Richie Astone to promote a positive image of Las Vegas. The collection also includes a songbook, vinyl record and ¼” tape recording, and promotional materials.