The Sutro Library is a branch of the California State Library located in San Francisco on the campus of San Francisco State University. The foundation of the library's collection was assembled by former San Francisco mayor, engineer, entrepreneur, and philanthropist Adolph Sutro. The library was deeded to the State of California by Sutro's heirs with the stipulation that it never leave the city limits of San Francisco, filling his desire to provide the city with a public research library. It was formally given to California State Library in 1913, and opened to the public in 1917. Notably, half of the Sutro collection survived the “Great Fire” after the 1906 earthquake. Collection highlights include 125,000 rare books, antiquarian maps, and archival collections, as well as a genealogical library.