Williamson, Alex K. <br/><br/>
Ground-water flow in the Gulf Coast aquifer systems, south-central United States / 
by Alex K. Williamson and Hayes F. Grubb. 
 - Washington, DC :  Denver, CO :  U.S. G.P.O. ;  For sale by the U.S. Geological Survey, Information Services,  2001. 
<br/><br/><label>Subjects--Index Terms: </label>გეოლოგია მიწისქვეშა წყლების ნაკადი