@article{197509,
      note = {Contours are of total magnetic field intensity.},
      author = {Langenheim, Victoria E. and Jachens, Robert C.},
      url = {http://library.usi.edu/record/197509},
      title = {Aeromagnetic map of the San Diego 1:100,000-scale  quadrangle, California--Baja California Norte [microform]  /},
      publisher = {The Survey ;},
      recid = {197509},
      pages = {1 map ;},
      address = {[Reston, Va.?] :},
      year = {1993},
}