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 E. W. Smith Glass Plate Negatives (approximately 1900-1916) contain original glass plate negatives created by E. W. Smith during his time in Tonopah, Manhattan, Goldfield, and other central Nevada mining towns in the early 1900s. All photographs are presumed to be taken by E. W. Smith unless noted otherwise in the inventory. The negatives were collected by Warren Virgil "Mac" McGowan, who along with his wife Hilda lived in Tonopah, Nevada from approximately 1930 to the 1960s. He was the town photographer and ran a store and boarding house located at what is now 111 N. Main Street in Tonopah.

The material is comprised of the organizational records of the Imperial Royal Sovereign Court of the Desert Empire and its predecessor, the Royal Barony of the Desert Empire, from 1997 to 2003. The records contain administrative and financial records such as charters, bylaws, financial reports, meeting minutes, correspondence, and publicity documenting the club’s activities in Southern Nevada.