@misc{indiciaebe873183e403,
  title = {Geologic map of the polar regions of Mars},
  author = {K. L. Tanaka and D. H. Scott},
  year = {1987},
  doi = {10.3133/i1802c},
  url = {https://pubs.usgs.gov/publication/i1802C},
  note = {Source identifier: i1802C}
}