@article{199594,
      note = {Relief shown by contours and spot heights.},
      author = {Langenheim, Victoria E.},
      url = {http://library.usi.edu/record/199594},
      title = {Isostatic residual gravity map of the Santa Ana  1:100,000-scale quadrangle, California [microform] /},
      publisher = {The Survey ;},
      recid = {199594},
      pages = {1 map ;},
      address = {[Menlo Park, Calif.] :},
      year = {1991},
}