@article{219605,
      recid = {219605},
      title = {Potentiometric surface of the Magothy Aquifer in southern  Maryland [microform] /},
      publisher = {U.S. Geological Survey ;},
      address = {Towson, Md. :},
      pages = {maps ;},
      note = {Potentiometric contours.},
      url = {http://library.usi.edu/record/219605},
}