@misc{indiciaeaf7d77d7e572,
  title = {Geologic map of the north polar region of Mars},
  author = {Kenneth L. Tanaka and Corey M. Fortezzo},
  year = {2012},
  doi = {10.3133/sim3177},
  url = {https://pubs.usgs.gov/publication/sim3177},
  note = {Source identifier: sim3177}
}