Tucson's Carnegie Free Library was completed in 1901. Architect Henry Trost designed it. Andrew Carnegie funded more than 2,500 libraries between 1883 and 1929, and this was Tucson's. The building now houses the Children's Museum Tucson.
Source: Children's Museum Tucson, institutional history and visitor information; Tucson Historic Preservation Foundation, historical documentation of Henry C. Trost's work; Carnegie Corporation of New York, history of Carnegie libraries