@misc{indiciaec2171e1b8d54,
  title = {Geologic map of the Mare Boreum area of Mars},
  author = {A. L. Dial},
  year = {1984},
  doi = {10.3133/i1640},
  url = {https://pubs.usgs.gov/publication/i1640},
  note = {Source identifier: i1640}
}