@misc{indiciae28ee0e7d40c2,
  title = {Geologic map of the Hellas Quadrangle of Mars},
  author = {D.B. Potter},
  year = {1976},
  doi = {10.3133/i941},
  url = {https://pubs.usgs.gov/publication/i941},
  note = {Source identifier: i941}
}