Materials contain photographs of J. T. McWilliams and the McWilliams family from 1930 to 1938. McWilliams was a surveyor and civil engineer who founded the original Las Vegas townsite (McWilliams Town). He also owned a portion of Lee Canyon, which he donated to become a public park.
Materials include photographs of Panaca, Nevada from 1890 to 1972, including photographs of Panaca's schools, buildings, Elbert Edwards's family home, geographic features near the town, and people working.
Materials contain photographs of Moapa Valley and the Muddy River in Nevada from 1948, including photographs of Elbert Edwards measuring erosion near the Muddy River and irrigation projects.