@article{218619,
      recid = {218619},
      author = {Weems, R. E.},
      title = {Newly recognized en echelon fall lines in the Piedmont and  Blue Ridge provinces of North Carolina and Virginia, with a  discussion of their possible ages and origins [microform]  /},
      publisher = {U.S. Geological Survey ;},
      address = {Reston, VA :},
      pages = {28 leaves, [12] leaves of plates :},
      year = {1998},
      note = {Cover title.},
      url = {http://library.usi.edu/record/218619},
}