TY - RPRT TI - Digital surfaces and thicknesses of selected hydrogeologic units within the Ozark Plateaus aquifer system, northwestern Arkansas AU - John B. Czarnecki AU - Susan E. Bolyard AU - Rheannon M. Hart AU - Jimmy M. Clark PY - 2014 DO - 10.3133/sir20135208 UR - https://pubs.usgs.gov/publication/sir20135208 ID - sir20135208 ER -