S. Douglass Crockwell was one of several post office muralists to also work for the Saturday Evening Post. You can see examples of his work at the websites for the Smithsonian American Art Museum, the American Art Archives, and the National Museum of American Illustration.
Crockwell made three post office murals: Signing of the Treaty of Dancing Rabbit Creek (Macon, Mississippi), Endicott, 1901 – Excavating for the Ideal Factory (Endicott, New York), and Vermont Industries (White River Junction, Vermont).