Hydrogeologic framework bottom elevations and thicknesses of Permian, Upper Pennsylvanian, Lower Pennsylvanian, and Mississippian units in the Appalachian Plateaus Physiographic Province
As part of the U.S. Geological Survey Water Availability and Use Science Program 
study of Appalachian Plateaus aquifers, bottom elevations and thicknesses were 
determined for Permian, Upper Pennsylvanian, Lower Pennsylvanian, and 
Mississippian hydrogeologic framework units in the Appalachian Plateaus, 
covering …