North Dakota Classed Layers This shapefile set is part of our entire United States base pulled from the U.S. National Atlas. International Mapping has enhanced the value of these files through careful editing and relayering. The drainage layers have been classed into three levels, the cities have had extra GNIS populated places added, and the roads’ classification has been simplified into four types. The entire unedited National Atlas base can be downloaded at http://www.nationalatlas.gov/atlasftp.html. State and County Boundaries Cities Drainage Roads