Broad Street cholera mortalities: original files provided by Jim Detwiler,
who had collated them for David O'Sullivan for use on the cover of
O'Sullivan and Unwin (2003), based on earlier work by Waldo Tobler and
others; this version is available as a compressed archive of a <a href="datasets/snow_location.tgz">GRASS location</a>, and a <a href="datasets/snow_files.zip">collection</a> of GeoTiff and shapefiles exported from this location.
