@misc{indiciae7bcf9278e6a5,
  title = {Geologic Map of the Hellas Region of Mars},
  author = {Gregory J. Leonard and Kenneth L. Tanaka},
  year = {2001},
  doi = {10.3133/i2694},
  url = {https://pubs.usgs.gov/publication/i2694},
  note = {Source identifier: i2694}
}