@article{22020,
      author = {Nettleton, L. L.},
      url = {http://library.usi.edu/record/22020},
      title = {Elementary gravity and magnetics for geologists and  seismologists,},
      publisher = {Society of Exploration Geophysicists},
      recid = {22020},
      pages = {x, 121 p.},
      address = {[Tulsa, Okla.]},
      year = {1971},
}