Gosselin, D. C., Harvey, F. E., Flowerday, C .F., 2003. Geology, Groundwater Chemistry and Management of the Dakota Aquifer in Nebraska (ESN-6): 6 pp., size 8.5 x 11". Description: The lead authors of this fact sheet use groundwater chemistry to assess the history of the water in the Dakota aquifer and explore management issues related to it. The Dakota is a key secondary aquifer, particularly in the eastern part of the state, but its water is fairly to very mineralized. It may also lie under confining layers of shale, clay or silt, which may restrict recharge and require special management strategies.