@article{241255,
      note = {Cover title.},
      author = {McDowell, Robert C.,},
      url = {http://library.usi.edu/record/241255},
      title = {Preliminary geologic map of the Winchester 30 x 60 minute  quadrangle, West Virginia, Virginia, and Maryland  [microform] /},
      publisher = {U.S. Geological Survey,},
      recid = {241255},
      pages = {8, [4] leaves :},
      address = {[Reston, VA] :},
      year = {1991},
}