Digital map of water-level changes in the High Plains aquifer in parts of Colorado, Kansas, Nebraska, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming, predevelopment (about 1950) to 2007
This data set consists of digital water-level-change contours for the High Plains aquifer 
in the central United States, predevelopment (about 1950) to 2007.  The High Plains 
aquifer extends from south of 32 degrees to almost 44 degrees north latitude and from 
96 degrees 30 minutes to 104 degrees west longitude. …