Aquifiers of Arkansas - Protection, Management, and Hydrologicand Geochemical Characteristics of Groundwater Resources in Arkansas Timothy M. Kresse and Phillip D. Hays and Katherine R. Merriman and Jonathan A. Gillup and Anna M. Nottmeier and Joshua M. Blackstock and D. Todd Fugitt and Jane L. Spellman and Drew A. Westerman and James L. Battreal