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    • Hereford Quadrangle: Hydrogeology 

      Duigon, Mark T. (Baltimore: Department of Natural Resources, Maryland Geological Survey, 1981)
      Quadrangle Atlas No. 18. Includes Sheets: Map 1. Slope of Land Surface (SLOPE). Map 2. Locations of Wells and Springs (WS). Map 3. Depth to Water Table (WT). Map 4. Availability of Ground Water (GW). Map 5. Geohydrologic ...