@article{222916,
      note = {Relief shown by contours and spot heights.},
      author = {Drake, Avery Ala,},
      url = {http://library.usi.edu/record/222916},
      title = {Geologic map of the Piedmont in the Beltsville, Laurel,  and Washington East quadrangles, Montgomery, Prince  Georges, Howard, and Anne Arundel counties, Maryland, and  the District of Columbia [microform] /},
      publisher = {The Survey,},
      recid = {222916},
      pages = {1 map +},
      address = {[Reston, Va.?] :},
      year = {1998},
}