Tracking a Tornado, by Lapham, Increase Allen 1811-1875, August 21, 1857, Smithsonian Archives - History Div, Report from I. A. Lapham of Milwaukee to the Smithsonian Meteorological Project regarding the map showing the track of a tornado that had passed over the eastern portion of Wisconsin on August 21, 1857. See SIA2010-0732 for the map..