20250210 16063400 1.0 TRUE Aquifer Characteristics Of Glacial Drift This shape file was derived from the 1981 publication of the Hydrological Atlas of Michigan plate 26. Three plates of the Aquifer Characteristics of Glacial Drift map were scanned, geo-rectified and used as a backdrop in the digitizing of this polgon vector file. Remote Sensing & GIS Research and Outreach Services(RS&GIS), Michigan State University