The maps were composed in ArcView 9.2, using a combination of digital census geography, archival maps, and historical and contemporary datasets.

The base map for the home and the documents pages is Plate I from N.M Fenneman, Geology and Mineral Resources of the St. Louis Quadrangle (United States Geological Survey, Bulletin 438, 1911). The base map for the other map series is the ESRI shaded world relief layer, based on the USGS’s National Elevation Data (NED) data.