@article{N 92-28620,
      recid = {179806},
      author = {Langel, R. A. and Baldwin, R. T.},
      title = {Types and characteristic of data for geomagnetic field  modeling [microform] /},
      publisher = {National Aeronautics and Space Administration, Office of  Management, Scientific and Technical Information Program ;},
      address = {[Washington, DC] :},
      number = {N 92-28620},
      pages = {1 v.},
      year = {1991},
      note = {Distributed to depository libraries in microfiche.},
      url = {http://library.usi.edu/record/179806},
}