@misc{indiciae882e3ae35aba,
  title = {Description of a user-oriented geographic information system - The resource analysis program},
  author = {Tilmann, S. E. and Mokma, D. L.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19810061644},
  note = {Source identifier: 19810061644}
}