@article{216309,
      note = {Relief shown by contours and spot heights.},
      author = {Billingsley, George H.},
      url = {http://library.usi.edu/record/216309},
      title = {Geologic map of the Poverty Spring quadrangle, northern  Mohave County, Arizona /},
      publisher = {The Survey,},
      recid = {216309},
      pages = {1 map :},
      address = {[Reston, Va.?] :},
      year = {1997},
}