@misc{indiciaef777be952c07,
  title = {From Mars to Greenland: Charting gravity with space and airborne instruments - Fields, tides, methods, results},
  author = {Colombo, Oscar L.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930071954},
  note = {Source identifier: 19930071954}
}