@misc{indiciae4d49fe8f7f0c,
  title = {Observations and impressions from lunar orbit},
  author = {Mattingly, T. K. and El-Baz, F. and Laidley, R. A.},
  year = {1972},
  url = {https://ntrs.nasa.gov/citations/19730013037},
  note = {Source identifier: 19730013037}
}