Unfortunately, none of these major works survive. They do live on as sources for the surviving histories of the Julio-Claudian dynasty. Suetonius quotes Claudius' autobiography once, and must have used it as a source numerous times. Tacitus may have used him for some of the more antiquarian passages in his annals. Claudius is the source for numerous passages of Pliny's "Natural History". Pliny credits him by name in Book VII 35.