@misc{indiciae9bfba240dded,
  title = {Geologic map of the eastern equatorial region of Mars},
  author = {Ronald Greeley and J. E. Guest},
  year = {1987},
  doi = {10.3133/i1802b},
  url = {https://pubs.usgs.gov/publication/i1802B},
  note = {Source identifier: i1802B}
}