TY - RPRT TI - Altitudes and thicknesses of hydrogeologic units of the Ozark Plateaus aquifer system in Arkansas, Kansas, Missouri, and Oklahoma AU - Drew A. Westerman AU - Jonathan A. Gillip AU - Joseph M. Richards AU - Phillip D. Hays AU - Brian R. Clark PY - 2016 DO - 10.3133/sir20165130 UR - https://pubs.usgs.gov/publication/sir20165130 ID - sir20165130 ER -