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 James D. O'Brien Photographs (approximately 1900-1929) are comprised of photograph albums and scrapbooks created by James D. O'Brien, surveyor, mining engineer and prospector. O'Brien's photographs feature locations throughout Central and Southern Nevada and Death Valley, California. Photographs depict life and work in mining camps; miners and their families; local Shoshone Indians; mining company financiers; landscape and mining towns. Locations include but are not limited to Pahrump, Nevada; Pioneer, Nevada; Rhyolite, Nevada; Wahmonie, Nevada; and Death Valley, California.

The John C. Olsen Photograph Collection, approximately 1950 to 1969, consists of black-and-white photographic prints and negatives. Images depict scenes from the annual Helldorado Celebration in Las Vegas, Nevada, the Shriners’ Parade in downtown Las Vegas, various hotels along the Las Vegas Strip, the Last Frontier Village at the Last Frontier Hotel, Las Vegas, natural landscapes at Mount Charleston and Rhyolite, Nevada, Hoover Dam and Lake Mead, Twin Lakes, and petroglyphs in Valley of Fire Nevada State Park.