The collection, dated 1941-1947, consists of loose-leaf notes from the daily journal of Arlin Rex Johnson (1898-1970), Budget and Planning Officer at the Coordinator of Information (COI) office in Washington, D.C. from September 2, 1941 to December 23, 1941, and a list of foreign visitors during his tenure as Assistant Director of Foreign Agricultural Relations at the United States Department of Agriculture from 1945-1947.

The James Cashman Sr. Papers date from approximately 1890 to 1969 and contain correspondence, photographs, insurance records, and bank records related to Cashman and his businesses in Southern Nevada. The collection documents the lives of the Cashman family and their businesses in southern Nevada.

The J. T. McWilliams Photograph Collection contains photographs and postcards from Nevada and Southern California from approximately 1900 to 1970. The materials include postcards depicting Las Vegas, Nevada casinos such as El Rancho Vegas and the Golden Nugget Gambling Hall. The materials also include postcards depicting towns and scenes in Nevada such as Carson City, Rhyolite, Red Rock Canyon, and covered wagons traveling to Las Vegas. Lastly, the materials contain several photographs of the McWilliams family, possibly while they were living in what is now Las Vegas, Nevada.

The Elmo and Charlotte Ellsworth Photograph Collection (approximately 1940-1959) is comprised of black-and-white photographic prints and negatives. The images depict Charlotte and Elmo Ellsworth. Also included is an image of Elmo Ellsworth on horseback at the Las Vegas, Nevada airport for the arrival of the first United Airlines flight and an image of people at the Last Frontier Village in Las Vegas.

The John Wittwer Collection on Agriculture in Nevada (1898-1972) contains the professional papers and records of John Wittwer in his capacity as an Agricultural Extension agent for the University of Nevada from 1921 to 1954. The records are primarily annual reports containing text, photographs, newspaper clippings, and charts that provide a rich chronicle of the conditions of agriculture and ranching in southern Nevada from 1898 to 1972, with the bulk of the material dating from 1929 to 1955. These conditions span water issues, such as flood control and irrigation, to the general difficulties of sustaining agriculture and viable food production in a desert environment. The reports come from the Agricultural Experiment Stations in Clark and Lincoln counties and most contain both a statistical report and a narrative summary.