1. Potentiometric-surface map, October through December 1988, and water-level change map, 1983-88, of the Mississippi River alluvial aquifer in northwestern Mississippi Yale Public content 1993. 2009-02-23T14:37:35Z. 2011-03-04T18:44:35Z. Geological Survey (U.S.). The Survey ; Copies can be purchased from Books and Open-File Reports Section. English. Public. Mississippi.