@misc{indiciae3a203e8223a1,
  title = {Geologic map of MTM -15027, -20027, -25027, and -25032 quadrangles, Margaritifer Terra region of Mars},
  author = {Rossman P. Irwin and John A. Grant},
  year = {2013},
  doi = {10.3133/sim3209},
  url = {https://pubs.usgs.gov/publication/sim3209},
  note = {Source identifier: sim3209}
}