1. Potentiometric surface of the Ozark Aquifer in Arkansas, Kansas, Missouri, and Oklahoma, November 2014-January 2015 Author/Creator: Groundwater Resources Program (U.S.), cartographer Publication/Creation: [Reston, Va.] : U.S. Department of the Interior, U.S. Geological Survey, Groundwater Resources Program, 2015 Resource Type: Map Access & Availability: Loading