TY - RPRT TI - Digital surfaces and thicknesses of selected hydrogeologic units within the Mississippi Embayment Regional Aquifer Study (MERAS) AU - Rheannon M. Hart AU - Brian R. Clark AU - Susan E. Bolyard PY - 2008 DO - 10.3133/sir20085098 UR - https://pubs.usgs.gov/publication/sir20085098 ID - sir20085098 ER -