“A Map of Vesuvius Showing the Directions of the Streams of Lava in the Eruptions from 1631 AD to 1831 AD,” John Auldjo,Sketches of Vesuvius: With Short Accounts of its Principal Eruptions, From the Commencement of the Christian Era to the Present Time (Naples: G. Glass, 1832). Houghton Library Harvard University, Cambridge, Mass.