The James H. Down Jr. Photograph Collection (approximately 1915-1940) consists of black-and-white photographic prints and negatives, as well as color photographic slides and postcards. The images depict scenes in and around Las Vegas and Goodsprings, Nevada. Also included are Glenn Davis' photographs of the Hoover Dam (Boulder Dam), Black Canyon, the Colorado River, and Lake Mead. Most of the images portray the construction phases of the Hoover Dam.

The Woodrow Wilson Photograph Collection consists of black-and-white photographic prints and negatives. The images depict black elected government leaders attending the first Conference of Black Elected Officials held in Washington, D.C. in September 1969. Of particular interest are images of Nevada's first black state legislator, Woodrow Wilson; Georgia state representative, Julian Bond; and President Richard Nixon.

The Hotel Last Frontier Photograph Collection contains photographic prints, negatives, and slides depicting scenes inside and outside the Hotel Last Frontier in Las Vegas, Nevada between approximately 1940 and 1969. The collection also includes photographs under its alternate names: the Last Frontier and the New Frontier Hotel and Casino.

The J. Ross Clark Scrapbook dates from approximately 1897 to 1972 and consists of newspaper clippings collected by his wife, Miriam Evans Clark. The clippings relate to professional events in the lives of J. Ross Clark and his brother, Senator William A. Clark. A small number of the clippings refer to births, marriages, and deaths in Miriam Evans and J. Ross Clark's families. Also included are documents written by J. Ross Clark's grand-niece, Dorothy Murdock Dunkley, that offer additional information about the Clark and associated families.